Five new species of Cortinarius (Cortinariaceae) from Yunnan, China, based on molecular and morphological evidence

<i>Cortinarius</i> is a globally distributed, exceptionally species-rich genus of Cortinariaceae, serving as important ectomycorrhizal fungi. Yunnan province, located in southwestern China, boasts a vast array of environmental conditions and fungal resources, with numerous new <i>Cortinarius</i> species yet to be discovered. Based on morphological evidence and phylogenetic inference using a two-locus dataset, five novel species have been identified within the genus, namely <i>C.brunneoverrucosus</i>, <i>C.coriaceus</i>, <i>C.fuscocandidus</i>, <i>C.neodisjungendus</i>, and <i>C.sinoconfirmatus</i>. Notably, two of these species (<i>C.brunneoverrucosus</i> and <i>C.neodisjungendus</i>) occur in subtropical areas, while the other three species (<i>C.coriaceus</i>, <i>C.fuscocandidus</i>, and <i>C.sinoconfirmatus</i>) inhabit subalpine temperate areas. Taxonomic descriptions for these five species are provided.