PIONEER MICRO CAP FUND, 497J, 1997-09-05

PIONEER MICRO CAP FUND
497J, 1997-09-05

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                             PIONEER MICRO-CAP FUND
                                 60 State Street
                                Boston, MA 02109


                                                          September 5, 1997

VIA ELECTRONIC TRANSMISSION

Securities and Exchange Commission
File Desk
Judiciary Plaza
450 Fifth Street, NW
Washington, DC  20549

Re:           Pioneer Micro-Cap Fund (the "Fund")
              File Nos. 333-18639 and 811-7985
              CIK No. 0001025187

Ladies and Gentlemen:

              Pursuant to Rule 497(j)  under the  Securities  Act of 1933,  this
letter  certifies that the  Prospectus  and Statement of Additional  Information
that would have been  required to be filed under  paragraph (c) of Rule 497 does
not differ from that contained in the Post-Effective Amendment, dated August 29,
1997  and  that  the  text of the  Post  -Effective  Amendment  has  been  filed
electronically, Accession No. 0001025187-97-000009.

              If you have any  questions or comments  concerning  the  enclosed,
please contact me at (617) 742-7825 (collect).

                                                 Very truly yours,

                                                      /s/ Elizabeth Watson
                                                      Elizabeth Watson



     cc:      Mses. Rajotte/Alves
              Mr. Joseph P. Barri, Esq.
              Mr. Mark P. Goshko, Esq.