Mensularia lithocarpi sp. nov. from Yunnan Province, southwestern China

Mensularia lithocarpi is described and illustrated from Yunnan Province, southwestern China. Both morphological and phylogenetic evidence indicates the new species belongs to Mensularia. It is distinguished from two quite similar species, Mensularia nodulosa and M. hastifera, by the combination of lack of hymenial setae, presence of hyphoid setae, smaller basidiospores, and growth on Lithocarpus chintungensis in southwestern China.