Two new species of Agaricales and a new Japanese record for Chaetocalathus fragilis from Ishigaki Island, a southwestern island of Japan

Abstract

Two new species of Agaricales and a new Japanese record for Chaetocalathus fragilis from Ishigaki Island, a southwestern island of Japan, are fully described and illustrated: (1) Crinipellis (section Grisentinae) rhizomorphica sp. nov. produces brownish orange, fibrillosesquamulose basidiomata accompanied by white thread-like rhizomorphs on the dead twig, olivaceous hairs in KOH, and oblong-ellipsoid, relatively long basidiospores; (2) Chaetocalathus (section Holocystis) fragilis is a new record for Japan, growing on the dead twig; (3) Psilocybe (section Cubensae) capitulata sp. nov. forms a furfuraceous- squamulose pileus, cyanescent flesh, a persistent, membranous annulus, capitulate pilocystidia, and has a coprophilous habit on cow dung.