Hydnoporia, an older name for Pseudochaete and Hymenochaetopsis, and typification of the genus Hymenochaete (Hymenochaetales, Basidiomycota)

The genus name Hydnoporia is reinstated to encompass the Hymenochaete tabacina group currently addressed to Pseudochaete (illegitimate genus) or Hymenochaetopsis. Identity of the type species of Hydnoporia, Sistotrema fuscescens (= Hydnoporia olivacea in current sense), is clarified, and a lectotype is selected. In total, 12 species are combined in Hydnoporia: H. corrugata, H. gigasetosa, H. lamellata, H. laricicola, H. latesetosa, H. lenta, H. rhododendri, H. rimosa, H. subrigidula, H. tabacina, H. tabacinoides, and H. yasudai. Hydnoporia diffissa is described as new. Analyses of all available ITS (94) and newly produced tef1 sequences (20) indicate that there are at least 20–27 species in the genus. Identity of the type species of Hymenochaete, H. rubiginosa, is clarified; the name is retained for the species so named in Europe while other species are present in North America and East Asia. Additionally, three new combinations in Hymenochaete are proposed: H. campylopora (= Cyclomyces fuscus), H. microcycla (= Cyclomyces tabacinus), and H. saepiaria.