Morphological characteristics and phylogenetic analyses revealed four new species (Basidiomycota) in the Yunnan-Guizhou Plateau, China

Four new fungi, <i>viz. Clavulinopsiswumengshanensis</i> (Clavariaceae, Agaricales), <i>Henningsomycesbambusae</i> (Porotheleaceae, Agaricales), <i>Xenasmabisterigmatae</i>, and <i>X.guttulata</i> (Xenasmataceae, Russulales), from Yunnan Province in China, are proposed, based on a combination of morphological features and molecular evidence. Phylogenetic analyses were conducted using a combined dataset of internal transcribed space and nuclear ribosomal RNA large subunit sequences. The ITS+LSU analysis showed that <i>Clavulinopsiswumengshanensis</i> <b>sp. nov.</b> groups with <i>C.aurantiocinnabarina</i>, <i>Henningsomycesbambusae</i> <b>sp. nov.</b> forms a sister group with <i>H.candidus</i>, <i>Xenasmabisterigmatae</i> <b>sp. nov.</b> is clustered with <i>X.rimicola</i>, and <i>X.guttulata</i> <b>sp. nov.</b> is clustered with <i>X.pruinosum.</i> The morphology and multi-gene phylogenetic analyses confirmed the placement of the four new taxa. <i>Clavulinopsiswumengshanensis</i> is distinguished by buff-yellow to straw-yellow basidiomata, clavate to subcylindrical basidia with four sterigmata, and subglobose basidiospores with several guttules (7-8.5 × 6-7.5 µm); <i>Henningsomycesbambusae</i> is characterized by white to cream basidiomata with short cylindric to tubular colonies, cylindrical to subcylindrical basidia with two sterigmata and globose to subglobose basidiospores (6.5-8.5 × 6.5-8.5 µm); <i>Xenasmabisterigmatae</i> can be characterized by its membranaceous and ash-grey basidiomata, clavate to subcylindrical basidia with two sterigmata and ellipsoid to subglobose basidiospores (10-12.5 × 8-10.5 µm); <i>X.guttulata</i> is distinguished by membranaceous and white to cream basidiomata, clavate to subcylindrical basidia with two sterigmata and ellipsoid to narrowly ellipsoid basidiospores (7-9 × 5.5-7.5 µm).