Three new species of and (Agaricales, Basidiomycota) from Northwestern China.

Members of the genera and are vital for litter decomposition in tropical and humid temperate forests. In this study, the difference in morphological features among , , and was confirmed by DNA data. and showed separate relationships with other species in the ITS and nLSU combined dataset utilized for the phylogeny of sect.

Four new species of Cortinariaceae (Agaricales) from Northwestern China.

Introduction: Cortinariaceae, which belongs to the Agaricales order, is a globally recognized family, known for its high species diversity.

Methods: Eight internal transcribed spacer (ITS) and nuclear large ribosomal subunit (LSU) sequences were newly generated, and phylogenetic analyses were performed by combining ITS and LSU datasets. Four species were identified as forming four independent lineages with robust support in phylogenies based on both datasets.