Two new species of Cortinarius (Cortinariaceae, Agaricales) from Southern China

Yuxiao Dang ¹ Mengjia Zhu ¹ Nemat O Keyhani ² Ziyi Wu ¹ Chenghao Qiu ³ Jinming Xiong ⁴ Huili Pu ¹ Longbing Lin ¹ Chengjie Xiong ¹ Zhiying Zhao ¹ Minhai Zheng ¹ Taichang Mu ¹ Yongsheng Lin ¹ Yanbin Huang ⁵ Xin Yuan ⁶ Chunjin Qiu ⁷ Xiaohong Ji ^8* Junzhi Qiu ^1* Yuxi Chen ^1*

• ¹ Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, China
• ² University of Illinois Chicago, Chicago, Illinois, United States
• ³ Xiangya Hospital, Central South University, Changsha, Hunan Province, China
• ⁴ Chinese Academy of Sciences (CAS), Beijing, Beijing, China
• ⁵ Management Bureau of Fujian Junzifeng National Nature Reserve, Sanming, China
• ⁶ Bureau of Fujian Longqishan National Nature Reserve, Sanming, China
• ⁷ Putian Institute of Agricultural Sciences, Putian, China
• ⁸ Jiujiang University, Jiujiang, Jiangxi Province, China

Cortinarius are globally distributed mushrooms, all of whom form mycorrhizae, and are characterized by rust-brown to brownish-red spores. Here, we describe two new species of Cortinarius, C. griseoaurantinus (subgenus Leprocybe) and C. yonganensis (subgenus Dermocybe), from Fujian Province, Southern China. Identification was conducted based on detailed morphological description coupled to molecular phylogenetic analyses of both nuclear ribosomal internal transcribed spacer (ITS) and nuclear ribosomal large subunit (nrLSU) sequences. C. griseoaurantinus is distinguished by its medium-sized basidiomata, bright orange to brownish orange pileus with the disc light to dark brown, and distinctly verrucose basidiospores (5.9) 6.1–6.5–7.5 (8.2) × (4.6) 4.8–5.3–5.9 (6.1). In contrast, C. yonganensis is characterized by its reddish-pink to deep jasper red pileus with a violet-brown conspicuous umbonate at center, margin with violet-brown striate, and punctate, subglobose basidiospores (5.0) 5.3–6.0–6.6 (7.4) × (3.9) 4.1–4.3–4.6 (4.7). Comprehensive morphological descriptions, color photographs of fresh basidiomata, photographs of microscopic characters, and phylogenetic trees are provided.