Four New Species and Six Combinations of Prunulus (Mycenaceae) from China

Four new species of Prunulus, found in China-P. applanatus, P. fulvescens, P. fulvipes and P. leptocollus spp. nov.-are described based on morphological and molecular phylogenetic analyses, performed using maximum likelihood (ML) and Bayesian inference (BI) methods on a concatenated dataset of the ITS, rpb1, and tef-1α gene regions. Prunulus applanatus is characterized by a pale grey-brown and applanate pileus with a slight lilac tint, and a distinctly striate margin. Prunulus fulvescens is characterized by a pileus fading from dark brown to yellowish-brown. Prunulus fulvipes is characterized by a pileus with a brown center and a lighter brownish-white margin, and a longer stipe with a yellowish-brown base. Prunulus leptocollus is characterized by pale lilac basidiomata, and cheilocystidia with slightly narrowed necks. Our study provides detailed anatomical illustrations and photographs of fresh basidiocarps from these species. Additionally, six Mycena species of sect. Calodontes-M. brunneocystidiata, M. rosea, M. subbrunnea, M. subpura, M. variispora, and M. violaceardesiaca-are combined with Prunulus based on the results of the phylogenetic analysis.