Four new species of Marasmius subgenus Globulares (Marasmiaceae, Agaricales) from subtropical regions of China

<i>Marasmius</i> is a large genus in Agaricales, exhibiting rich species diversity and a wide distribution. In this study, four new species of Marasmius belonging to the subgenus Globulares were identified in subtropical regions of China. Morphologically, <i>M.blandus</i> is characterized by a light orange pileus, with a non-striate surface, medium-sized basidiospores, and subfusiform to narrowly utriform pleurocystidia; <i>M.xingshanensis</i> is identified by a brown pileus, variably shaped pleurocystidia, and absence of cheilocystidia; <i>M.vulgaris</i> is identified by large basidiospores, which are up to 16.0 μm long, narrowly fusiform to lageniform pleurocystidia, often with capitate, papillate, or constricted moniliform structures at apices; <i>M.subpurpureostriatus</i> is recognized by a grayish-green pileus with deeply sulcate violet striae, lamellae distant, and clavate to fusoid-clavate basidiospores, which are up to 22.0 μm long. The distinct taxonomic status of these four new species was confirmed by their positions in the 4-locus (ITS, LSU, <i>tef-1α</i>, <i>rpb2</i>) phylogenetic trees. Detailed descriptions and morphological photographs of four new species are provided in this paper.