Second report of Polyporus longiporus and its phylogenetic position

Polyporus longiporus, belonging to group Polyporellus, is newly reported from Japan in what also constitutes the second report of the species since its original description. This species is characterized by radially elongated pores, smooth and brown to dark brown pileus, and cylindrical and slightly curved basidiospores. Phylogenetic analysis based on the ITS region revealed that P. longiporus forms a terminal, strongly supported clade that is closely related to P. ciliatus. A description and illustrations of the present species and a key to the species of group Polyporellus are provided.