Three new species of Gerronema (Agaricales, Basidiomycota) from southern China

Three new species of <i>Gerronema</i> are discovered from southern China. <i>Gerronemaangustum</i> is characterized by its small basidiomata, greenish-green pileus, slender stipe, narrow, and close lamellae. <i>Gerronemapubescence</i> is characterized by its pubescent pileus when young, yellowish white to pale yellow lamellae that are lighter towards the margin, narrowly cylindrical to lageniform pleurocystidia, and absent cheilocystidia. <i>Gerronemarhizomorpha</i> is characterized by its yellowish white to brown pileus, well-developed rhizomorphs at the stipe base, absent cheilocystidia and pleurocystidia, and not growing on rotten wood. Molecular phylogenetic analyses of nrITS + nrLSU support the species delimitation. In this study, detailed descriptions, photos of the basidiomata, line drawings, and discussions with related species are comprehensively provided. A key to the known <i>Gerronema</i> species in China is also provided.