Three new species and a new record of Cortinarius section Camphorati from southwestern China

Cortinarius sect. Camphorati consists of telamonioid species with violet basidioma, strong odor, and distinct cheilocystidia. In this study, phylogenetic analysis based on nuc rDNA internal transcribed spacer region ITS1-5.8S-ITS2 (ITS) and partial nuc rDNA 28S sequences has revealed three new species of the section from southwestern China, namely, C. longicystidiatus, C. megacystidiatus, and C. paraputorius, and a newly recorded species from southwestern China, viz., C. camphoratus, supplemented by the support from calculations of genetic distances of ITS sequences. Detailed descriptions of the four species are given with photographs, and their micromorphological characteristics are statistically compared. For species delimitation within the section, the size of basidiospores, the morphology of cheilocystidia, and the associated vegetation types and tree species are informative. A key to species in section Camphorati from the Northern Hemisphere is provided, and their geographic distributions and ecology are discussed.

Automated summary

This study reports four species of the Cortinarius section Camphorati, including three new species and a newly recorded species. Phylogenetic analysis based on nuclear rDNA sequences and genetic distance calculations support the classification of these species. Detailed descriptions and statistical comparisons of their morphological characteristics are provided. A key to species within the section and discussions on their geographic distribution and ecology are also included.