The Phanerochaete sordida group (Polyporales, Basidiomycota) in temperate Eurasia, with a note on Phanerochaete pallida

The taxonomy of the Phanerochaete sordida group is revised based on morphological and DNA studies of collections from the temperate zone of Eurasia. P. sordida sensu typi is predominantly a gymnosperm-dwelling species having long, tubular, apically thin-walled and non-encrusted cystidia and narrowly ellipsoid or thick cylindrical basidiospores. In phylogenetic analysis, P. sordida is rather distant from three other species possessing similar morphological characters; those species inhabit angiosperm hosts and have narrower, cylindrical basidiospores. P. livescens, comb. nova, is characterized by sharp-tipped, strongly encrusted cystidia with equally thickened walls. It is widely distributed in temperate forests of Eurasia. P. concrescens, sp. nova, is an East Asian species having blunt-tipped, only apically encrusted cystidia with gradually thickened walls. P. cumulodentata, comb. nova, is reintroduced for the European species formerly known as P. raduloides, and its identity versus P. magnoliae from North America is discussed. Additionally, P. pallida is restored as a good species; it is not related to the P. sordida group and clusters with P. jose-ferreirae within the Byssomerulius clade (Irpicaceae).