MORGENTHALER VENTURE PARTNERS IV
SC 13G/A, 2000-02-11
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION

                            WASHINGTON, D.C.  20549


                                  SCHEDULE 13G


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934





                             MotherNature.com, Inc.
  -----------------------------------------------------------------------------
                                (Name of Issuer)



                   Common Stock, $0.01 par value per share
  -----------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   61978K-105
  -----------------------------------------------------------------------------
                                 (Cusip Number)




Check the following if a fee is being paid with this statement [X]. (A fee
is not required only if the filing person:


(1) has a previous statement on file reporting beneficial ownership of
more than five percent of the class of securities described in Item 1;
and (2) has filed no amendment subsequent thereto reporting beneficial
ownership of five percent or less of such class.) (See Rule 13d-7.)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.


The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that
section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).





                      (Continued on the following page(s)

                                 Page 1 of 14


<PAGE>   2
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 2 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Morgenthaler Venture Partners IV, L.P.       34-1807476                                                |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  Delaware                                                                                         |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |     1,245,319        Note (1)                                   |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |     0                                                           |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |     1,245,319        Note (1)                                   |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  1,245,319       Note (1)                                                                         |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  8.24%                                                                                            |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  PN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   3
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 3 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Morgenthaler Management Partners IV L.P.      34-1807474                                             |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  Ohio                                                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |     1,245,319        Note (1)                                   |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |     0                                                           |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |     1,245,319        Note (1)                                   |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  1,245,319        Note (1)                                                                        |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  8.24%                                                                                            |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  PN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>   4
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 4 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  David T. Morgenthaler  ###-##-####                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |   1,245,319   Note (1)                                          |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |   0                                                             |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |   1,245,319   Note (1)                                          |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  1,245,319       Note (1)                                                                         |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  8.24%                                                                                            |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  IN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   5
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 5 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |   Robert D. Pavey       ###-##-####                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |   1,245,319   Note (1)                                          |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |   0                                                             |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |   1,245,319   Note (1)                                          |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  1,245,319        Note (1)                                                                        |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  8.24%                                                                                            |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  IN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   6

                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 6 OF   PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Robert C. Bellas, Jr.  ###-##-####                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |                                                                 |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |       1,245,319        Note (1)                                 |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |     0                                                           |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |     1,245,319        Note (1)                                   |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     | 1,245,319        Note (1)                                                                         |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |   8.24%                                                                                           |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |   IN                                                                                              |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   7
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 7 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Gary J. Morgenthaler  ###-##-####                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |                                                                 |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |   1,245,319        Note (1)                                     |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |   1,245,319        Note (1)                                     |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   1,245,319        Note (1)                                                                       |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |  8.24%                                                                                            |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  IN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   8
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  141907-10 5                                                                PAGE 8 OF    PAGES
<S>     <C>

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  John D. Lutsi  ###-##-####                                                                       |
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | SOURCE OF FUNDS*                                                                                  |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT                                 |
|     | TO ITEMS 2(d) OR 2(e)                                                                       [   ] |
|     |                                                                                              ---- |
|     |                                                                                                   |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   6 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              |
|     |                                                                                                   |
|     |   United States                                                                                   |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     7 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     8 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |  1,245,319        Note (1)                                      |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     9 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |  0                                                              |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |    10 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |  1,245,319        Note (1)                                      |
|-------------------------------|-------|-----------------------------------------------------------------|
|  11 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   1,245,319        Note (1)                                                                       |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN                                    |
|     | SHARES*                                                                                     [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|  13 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                                                |
|     |                                                                                                   |
|     |   8.24%                                                                                           |
|-----|---------------------------------------------------------------------------------------------------|
|  14 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |   IN                                                                                              |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   9
                                  Schedule 13G
                                  ------------


Item 1(a). NAME OF ISSUER: MotherNature.Com, Inc.

Item 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: One Concord Farms,
           490 Virgina Road, Concord MA 01742

Item 2(a). NAMES OF PERSONS FILING: Morgenthaler Venture Partners IV ("MVP IV");
           Morgenthaler Management Partners IV ("MMP IV"), the general
           partner of MVP IV; David T. Morgenthaler, Robert D. Pavey, Robert
           C. Bellas, Jr., Gary J. Morgenthaler, and John D. Lutsi
           (collectively, the "General Partners") are individual general
           partners of MMP IV, the general partner of MVP IV.

Item 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

           The address of the principal business office of MVP IV, MMP IV
           and each of the General Partners is:

           Morgenthaler Venture Partners IV
           50 Public Square,
           Suite 2700
           Cleveland, Ohio 44113

Item 2(c). CITIZENSHIP: MVP IV is a limited partnership organized under the laws
           of Delaware and MMP IV is a limited partnership organized under
           the laws of the State of Ohio. Each of the General Partners is a
           United States citizen.


Item 2(d). TITLE OF CLASS OF SECURITIES: Common Stock, $0.01 par value per share

Item 2(e). CUSIP NUMBER:    61978K 10 5

Item 3.    IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b), OR 13d-2(b),
           CHECK WHETHER THE PERSON FILING IS a:

           (a) [   ]    Broker or Dealer registered under Section 15 of the
                        Securities Exchange Act of 1934 (the "Act").

           (b) [   ]    Bank as defined in Section 3(a)(6) of the Act.

           (c) [   ]    Insurance Company as defined in Section 3(a)( 19) of the
                        Act.

           (d) [   ]    Investment Company registered under Section 8 of the
                        Investment Company Act of 1940.

           (e) [   ]    Investment Advisor registered under Section 203 of the
                        Investment Advisors Act of 1940.

<PAGE>   10

           (f) [   ]    Employee Benefit Plan, Pension Fund which is subject to
                        the provisions of the Employee Retirement Income
                        Security Act of 1974 or Endowment Fund; see Rule
                        13d-1(b)(1)(ii)(f) of the Act.

           (g) [   ]    Parent Holding Company, in accordance with Rule
                        13d-1(b)(ii)(G) of the Act.

           (h) [   ]    Group, in accordance with Rule 13d-1(b)(1)(ii)(H) of the
                        Act.

           Not Applicable.

Item 4.    OWNERSHIP.

          (a)  Amount Beneficially Owned: Each of MVP IV, MMP IV, David T.
               Morgenthaler, Robert D. Pavey, Robert C. Bellas, Jr., Gary J.
               Morgenthaler and John D. Lutsi may be deemed to own beneficially
               1,245,319 shares of the Common Stock of MotherNature.Com, Inc.
               (the "Company") as of December 31, 1999.

               MVP IV is the record owner of 1,236,674 shares. MMP IV, in its
               capacity as the general partner of MVPIV, may be deemed to own
               beneficially such 1,236,674 shares. MVPIV has been granted an
               option for 8,645 shares of Common Stock, all 8,645 shares are
               exercisable within 60 days of December 31, 1999.

          (b)  Percent of Class (based on 15,118,198 shares of Common Stock):

               MVPIV:  8.24%
               MMP IV: 8.24%
               David T. Morgenthaler: 8.24%
               Robert D. Pavey: 8.24%
               Robert C. Bellas, Jr.: 8.24%
               Gary J. Morgenthaler: 8.24%
               John D. Lutsi: 8.24%

<PAGE>   11

          (c)  Number of shares as to which such person has:

                 (i) sole power to vote or to direct the vote:

                     None

                (ii) shared power to vote or to direct the vote:

                     MVP IV: 1,245,319 shares
                     MMP IV: 1,245,319 shares
                     David T. Morgenthaler: 1,245,319 shares
                     Robert D. Pavey: 1,245,319 shares
                     Robert C. Bellas, Jr.: 1,245,319 shares
                     Gary J. Morgenthaler: 1,245,319 shares
                     John D. Lutsi: 1,245,319 shares

               (iii) sole power to dispose or direct the disposition of:

                     None

                (iv) shared power to dispose or direct the disposition of:

                     MVP IV: 1,245,319 shares
                     MMP IV: 1,245,319 shares
                     David T. Morgenthaler: 1,245,319 shares
                     Robert D. Pavey: 1,245,319 shares
                     Robert C. Bellas, Jr.: 1,245,319 shares
                     Gary J. Morgenthaler: 1,245,319 shares
                     John D. Lutsi: 1,245,319 shares


          Each of MVP IV and MMP IV and each of the General Partners expressly
          disclaims beneficial ownership of any shares of Common Stock of the
          Company, except in the case of MVP IV, for the 1,236,674 shares which
          it holds of record. MVP IV also holds 8,645 option shares of which all
          8,645 shares are exercisable within 60 days of December 31, 1999.

Item 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

          Not Applicable.

Item 6.   OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

          Not Applicable.

Item 7.   IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
          SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

          Not Applicable.
<PAGE>   12

Item 8.   IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

          Not Applicable. MVP IV, MMP IV and each of the General Partners
          expressly disclaim membership in a "group" as defined in Rule 13d-
          1(b)(ii)(H).

Item 9.   NOTICE OF DISSOLUTION OF GROUP.

          Not Applicable.

Item 10.  CERTIFICATION.

          Not Applicable. This statement on Schedule 13G is not filed pursuant
          to Rule 13d-1(b).




By signing below, I certify that, to the best of my knowledge and belief, the
securities referred to above were not acquired for the purpose of and do not
have the effect of changing or influencing the control of the issuer of such
securities and were not acquired in connection with or as a participant in any
transaction having such purposes or effect.



<PAGE>   13

MotherNature.Com, Inc.
Schedule 13G
Information included in report as of 12/31/99.


Footnotes

(1)  Amount includes 8,645 shares received from an option grant, all 8,645 are
     exercisable within 60 days of December 31, 1999.
<PAGE>   14

                                   SIGNATURES
                                   ----------


        After reasonable inquiry and to the best of its knowledge and belief, I
certify that the information set forth in this statement is true, complete, and
correct.


Date:   February



MORGENTHALER VENTURE PARTNERS IV

By: Morgenthaler Management Partners IV

By:     *
   ----------------------------------------
   General Partner

MORGENTHALER MANAGEMENT PARTNERS IV

By:     *
   ----------------------------------------
   General Partner

        *
   ----------------------------------------
   David T. Morgenthaler

        *
   ----------------------------------------
   Robert D. Pavey

        *
   ----------------------------------------
   Robert C. Bellas, Jr.

        *
   ----------------------------------------
   Gary J. Morgenthaler

        *
   ----------------------------------------
   John D. Lutsi



                         *By: /s/ Theodore A. Laufik
                             ---------------------------------------
                             Theodore A. Laufik
                             Attorney-in-Fact


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