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

ABSTRACTCortinarius 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.KEYWORDS: Cheilocystidiamorphologyphylogenytaxonomy3 new taxa ACKNOWLEDGMENTSThe authors thank Dr. Qing Cai, Dr. Xiang-Hua Wang, Ms. Fei-Fei Liu, Mr. Jian-Wei Liu, Mr. Jing Wang, and Dr. Xiao-Xia Ding (Kunming Institute of Botany, Chinese Academy of Sciences) for lending valuable specimens and Mr. Zhi-Jia Gu (Kunming Institute of Botany) for his assistance in using SEM. The authors are grateful to Mr. Jian-Wei Liu and Dr. Xiang-Hua Wang for the significant sequences they provided and to the editor and two anonymous reviewers for their help and constructive suggestions.DISCLOSURE STATEMENTNo potential conflict of interest was reported by the author(s).SUPPLEMENTARY MATERIALSupplemental data for this article can be accessed online at https://doi.org/10.1080/00275514.2023.2251365Additional informationFundingThis work was supported by the Yunnan Ten-Thousand-Talents Plan - Yunling Scholar Project (YNWR-YLXZ-2018-011) and the Joint Funds of the National Natural Science Foundation of China and Yunnan Provincial Government (U2202205).