Several times a small, unknown species of Coprinus has been found on paths covered with wood-chips and on composted vegetable refuse. The basidiocarps of this species look like miniature fruit-bodies of C. lagopus. As in literature no suitable name could be found, it is described here as new. I consider it an honour to name the species after Dr. R. A. Maas Geesteranus on the occasion of his 80th birthday.