Hydnophanerochaete and Odontoefibula, two new genera of phanerochaetoid fungi (Polyporales, Basidiomycota) from East Asia

<jats:p>Two new genera with phylogenetic affinities to <jats:italic>Phanerochaete</jats:italic> s.l. are presented, namely <jats:italic>Hydnophanerochaete</jats:italic> and <jats:italic>Odontoefibula</jats:italic>. The generic type of <jats:italic>Hydnophanerochaete</jats:italic> is <jats:italic>Phanerochaeteodontoidea</jats:italic>. <jats:italic>Odontoefibula</jats:italic> is established based on a new species: <jats:italic>O.orientalis</jats:italic> (generic type). Both genera have effused basidiocarps with odontioid hymenial surface, simple-septate generative hyphae, cystidia lacking, clavate basidia and ellipsoid basidiospores that are smooth, thin-walled, inamyloid, non-dextrinoid and acyanophilous. <jats:italic>Hydnophanerochaete</jats:italic> is additionally characterised by a compact texture in the subiculum with thick-walled generative hyphae and quasi-binding hyphae. <jats:italic>Odontoefibula</jats:italic> has a dense texture of subiculum with thin- to slightly thick-walled hyphae and further a dark reddish reaction of basidiocarps when treated with KOH. Multi-marker phylogenetic analyses based on sequences, inferred from the ITS+nuc 28S+<jats:italic>rpb1</jats:italic>+<jats:italic>rpb2</jats:italic>+<jats:italic>tef1</jats:italic> dataset, indicate that <jats:italic>Hydnophanerochaete</jats:italic> and <jats:italic>Odontoefibula</jats:italic> are placed in the Meruliaceae and <jats:italic>Donkia</jats:italic> clades of Phanerochaetaceae, respectively. <jats:italic>Phanerochaetesubodontoidea</jats:italic> is a synonym of <jats:italic>P.odontoidea</jats:italic>, according to morphological and molecular evidence.</jats:p>