Abstract
A new species of Micropsalliota, M. brunneosquamata is described and illustrated from northern Thailand based on both morphological and molecular data. The new species is characterized by brownish, erect scales at the centre of the pileus, a stipe covered by concolourous fibrils, and microscopically, by the shape of cheilocystidia which sometimes show obtuse mucro at apex. The new species is compared with morphologically similar species. Phylogenetic analyses of ITS sequences also support its novelty.