(Hymenochaetales, Basidiomycota), a new species on from Japan and an identification key to worldwide species of .

, in the Hymenochaetaceae, is a polypore genus with a worldwide distribution. The new taxon is introduced, which is the first species to originate from Japan. This species grows exclusively on living and is distinguished by annual, sessile basidiocarps that occur in clusters, pileal surface of narrow, concentrically sulcate zones, 6-8 pores per mm, duplex context separated by a black zone, dimitic hyphal system and broadly ellipsoid basidiospores, 3.2-4 × 2.3-3.1 µm. Phylogenetically, is nested within the clade as a distinct terminal lineage with full statistical supports and sister to the clade of , P. cf. pulla and with weak supports. Besides , and , is the fourth species of recorded from Japan. An identification key to all accepted 48 species of is provided.