Three new species of Inonotus (Basidiomycota, Hymenochaetaceae) from China

Three new species of Inonotus are described and illustrated. Inonotus acutus sp. nov. is characterized by having small, thin basidiocarps with a strongly contracted base, a sharp and undulate pileus margin, ventricose hymenial setae, and ellipsoid, yellowish to yellow-brown, slightly thick-walled basidiospores. Inonotus chrysomarginatus sp. nov. differs in having an annual to perennial growth habit, pileate basidiocarps with a distinctly yellowish buff to golden-yellow margin, distinct setal hyphae and hooked hymenial setae, and broadly ellipsoid to subglobose, pale yellowish, slightly thick-walled and weakly cyanophilous basidiospores. Inonotus rigidus sp. nov. is distinguished by its resupinate and hard rigid basidiocarps, the honey-yellow pore surface, and smaller pores; microscopically, it has ellipsoid, yellowish brown and thick-walled basidiospores, and lacks both setal hyphae and hymenial setae. An identification key to the Chinese species of Inonotus sensu stricto is provided.