Pluteus losulus, a new record from south China

Pluteus losulus is reported as a new record from China. It is characterized by its low umbo with brown to grayish-brown pileus, hooked and metuloid pleurocystidia, variable cheilocystidia, presence of caulocystidia, and frequent presence of clamp connections in the pileipellis. New data from the nuclear ribosomal internal transcribed spacer (ITS) region place this species in a sub-basal clade of P. sect. Pluteus. A morphological description, illustrations, and phylogenetic placement of the Chinese P. losulus collection are provided.