Molecular Systematics and Taxonomic Analyses of Three New Wood-Inhabiting Fungi of Hyphoderma (Hyphodermataceae, Basidiomycota)

Abstract

In this present study, three new wood-inhabiting fungal taxa, <i>Hyphoderma niveomarginatum</i>, <i>H. sordidum</i> and <i>H. weishanense,</i> are proposed. <i>Hyphoderma niveomarginatum</i> is characterized by the ceraceous basidiomata having a smooth, cracking hymenial surface and the presence of the moniliform cystidia and ellipsoid basidiospores (7-9 × 3.5-5 µm). <i>Hyphoderma sordidum</i> is characterized by its resupinate basidiomata with a smooth hymenial surface with the fimbriate margin, the presence of the tubular cystidia and ellipsoid basidiospores (3-4.5 × 2-3 µm). <i>Hyphoderma weishanense</i> differs in its membranous basidiomata with a slightly buff to buff hymenial surface and the presence of broadly ellipsoid basidiospores (4.5-8.5 × 4-7 µm). Sequences of ITS+nLSU+mt-SSU+RPB1+RPB2 genes were used for the phylogenetic analyses using three methods. The ITS+nLSU+mt-SSU+RPB1+RPB2 analysis of the genus <i>Hyphoderma</i> indicated that the 3 new species of <i>Hyphoderma</i> were nested into genus <i>Hyphoderma</i>, in which <i>H. niveomarginatum</i> formed a single group and then grouped with <i>H. membranaceum</i> and <i>H. sinense</i>; <i>H. sordidum</i> was a sister to <i>H. nudicephalum</i>; and <i>H. weishanense</i> closely grouped with <i>H. crystallinum</i>.