Cortinarius subanomalus M. L. Xie, T. Z. Wei & Y. Li 2025, sp. nov.

Cortinarius subanomalus M.L. Xie, T.Z. Wei & Y. Li, sp. nov. MB 843754. Figs 4G, H, 6P, 7P. Etymology: The name refers to the affinity to Cortinarius anomalus. Typus: China, Yunnan Province, Shangri-La County, in Quercus aquifolioides forest, alt. 3609 m, 25 Sep. 2012, Q. Zhao (holotype HMJAU 48752). Pileus 15–30 mm diam., hemispherical when young, later convex, surface weakly hygrophanous, innately fibrillose, greyish violet at first, then pale orange to greyish orange, dull. Lamellae emarginate to adnexed, moderately crowded, dark violet when young, then brown, edges paler and even. Stipe 50–80 mm long, 6–10 mm thick, cylindrical to subcylindical, somewhat thickened at the base, surface persistently violaceous tinged fibrillose at the lower part, violet at the apex, basal mycelium violet. Universal veil violet at first, then discolouring yellowish. Context fleshy, at first whitish with ± violet tinge, greyish violet at the stipe apex, sometimes becoming hollow in stipe. Odour radish. Taste mild. Basidiospores 6.8–8.8(–9.7) × 5.8–7.7 μm, Q = 1.06–1.31, Xav. = 7.9–8.1 × 6.6–6.8 μm, Qav. = 1.16–1.21, subglobose to broadly ellipsoid, moderately verrucose. Basidia clavate, 4-spored, hyaline to subhyaline, rarely yellowish to yellowish brown. Lamellar edge fertile. Pileipellis duplex: epicutis well developed, hyphae parallel, hyaline to yellowish brown, 2–7 μm wide, smooth; hypocutis well developed, hyphae 8–30 μm wide, hyaline, cylindrical to enlarged, smooth. Clamp connections present. Ecology and distribution: Solitary to gregarious in Quercus aquifolioides forests, or mixed forests of Picea and Betula. Known from Yunnan and Xizang of China. Additional specimens examined: China, Xizang Autonomous Region, Linzhi City, Bomi County, in mixed forests Picea and Betula, alt. 2750 m, 19 Sep. 2016, T.Z. Wei, Z.X. Wu, L. Yang, H.D. Zheng & X.C. Wang, HMAS 277626; Linzhi City, Lulang Town, in Quercus aquifolioides forest, alt. 3280 m, 4 Sep. 2020, M.L. Xie, HMJAU 48755, HMJAU 48769. Notes: Cortinarius subanomalus produces small basidiomata, the pileus ranges greyish violet to greyish orange, the universal veil is violet, the stipe has persistently violet tinged fibrillose at the lower part, the context is usually hollow in stipe, and the basidiospores are subgloboid to broadly ellipsoid. Cortinarius subanomalus is similar to C. anomalus, but the latter usually has a whitish universal veil and forms a sock like sheath on the stipe, and the basal mycelium is white (Dima et al. 2016, 2021). The most closely related species of C. subanomalus is C. anomalus from which it differs by 12 substitutions and indel positions in nrITS region, with a similarity of 97.9 %.