We have collected at least six distinct species of Psathyrella  in the Hawaiian
Islands.  Three of these are quite common at Koke`e State Park on Kaua`i, including
the one illustrated.  Although presently undetermined, this species is distinct because
of the strongly rugulose-corrugated, honey brown pileus, a submembranous partial
veil that remains as an appendiculate margin, and growth on endemic koa (Acacia
koa  A. Gray).