Three new species of Cylindrobasidium (Physalacriaceae, Agaricales) from East Asia

Species of the corticioid genus Cylindrobasidium are saprophytes or parasites in forest ecosystems. This study presents three new species of Cylindrobasidium from East Asia, according to study of morphological characteristics, and phylogenetic analyses based on sequence data inferred from nuc rDNA internal transcribed spacer ITS1-5.8S-ITS2 (ITS) region and nuc 28S rDNA (28S). Cylindrobasidium bifidum has smooth hymenophore, subicular cystidia with bifurcate apex, fusiform hymenial cystidia, and pyriform basidiospores. Cylindrobasidium macrosporum is characterized by having smooth to tuberculate hymenophore, presence of guttulate, subicular cystidia with bifurcate apex, presence of guttulate, cylindrical hymenial cystidia with narrow apices, and large, guttulate, fusiform basidiospores. Cylindrobasidium sublaeve has effused to effused-reflexed basidiomata with smooth hymenophore, subfusiform or cylindrical hymenial cystidia, and pyriform basidiospores. A key to species of Cylindrobasidium is provided.