Collybiopsis and its type species, Co. ramealis

Abstract

Collybiopsis (Omphalotaceae, Agaricales) is accepted as the correct genus name for a large clade of non-typical Gymnopus. The type species of Collybiopsis (Agaricus ramealis) is shown to be a genetic complex. Collybiopsis filamentipes, Co. furtiva, Co. hasanskyensis, and Co. minor are proposed as spp. nov. and Co. californica as a stat. nov. Thirty-four additional Collybiopsis comb. nov. are proposed in Appendix I.