Abstract: While examining herbarium material kept in the Mycological Herbarium, National Sci-ence Museum, Tokyo, Japan (TNS) and recent field collection. One new taxon Secotium himalaicum Zang et Doi was collected from elliptical, subfusiform, thick-walled, hyaline basidiospores (14.3-19.5 x 6-7.5 um) and lamellar gleba, the gleba is cellular, but as maturity is approached the elongate cavities and assumes the gill appearance. It is close to Secotium agaricoides. (Czerniaiev) Hollos, but differs in the much larger size of the basidiospores, the latter about the size of spores is smaller, only 5-9 um diameter.

Key words: Secotium himalaicum