Cortinarius perrotensis A. Paul et al.

Xie, M. L., Dima, B., Wang, K., Phukhamsakda, C., Li, Y., Qi, L. L., Li, G. J., Liu, T. Z., Jia, P. S., Wang, Q., Song, L. R., Wei, T. Z. & Li, Y., 2025, Taxonomy and phylogeny of Cortinarius sect. Anomali in China, Persoonia 54 (1), pp. 225-263 : 250

Cortinarius perrotensis A. Paul et al. , Mycol. Progr. 20: 1429. 2021. Figs 3F , 6K , 7K .

Pileus 16–32 mm diam., convex when young, later plane, margin inrolled at first; surface innately fibrillose, somewhat viscid when moist, soon drying with shiny; greyish brown, paler at the margin. Lamellae emarginate, moderately crowded, violet at first, soon greyish violet to pale brown, edges slightly serrate. Stipe 32–69 mm long, 5–8 mm thick above, clavate, thickened at the base (9–15 mm); surface fibrillose, whitish, blue tinge at the apex when young, basal mycelium whitish. Universal veil white, soon yellowish, sometimes forming a sock like sheath on the stipe. Context fleshy, whitish, at first bluish in the stipe apex. Odour indistinct. Taste mild. Basidiospores 6.8–8.4 × 5.4–6.1 μm, Q = 1.17– 1.41, Xav. = 7.6 × 5.8 μm, Qav. = 1.31, subglobose, broadly ellipsoid to ellipsoid, moderately verrucose. Basidia clavate, 4-spored, hyaline to subhyaline, rarely light olivaceous brown to olivaceous brown. Lamellar edge fertile. Pileipellis duplex: epicutis of hyaline, light olivaceous brown to olivaceous brown hyphae; hyphae 3–10 μm wide, smooth to weakly encrusted spots; hypocutis well developed, hyphae 8–23 μm wide, hyaline to olivaceous brown, irregular, smooth. Clamp connections present.

Ecology and distribution: Gregarious in broadleaf-conifer forests of Betula and Larix . Known only from Heilongjiang Province in China. It was described from Eastern North America in broadleaf-conifer forests.

Specimen examined: China, Heilongjiang Province, Tahe County, Talin Forest Farm, in mixed forest of L. gmelinii and B. platyphylla , 28 Aug. 2016, M.L. Xie, HMJAU 48662.

Notes: Cortinarius perrotensis is a new record in China. It is a small-sized species. The pileus is usually greyish brown without a bluish tinge, the violet lamellae soon become pale brown and are slightly serrate at the edge. The basidiospores in Chinese materials, which average 7.6 × 5.8 μm, are slightly narrower than those of North American specimens. In phylogenetic analyses, the Chinese specimens formed a well-supported monophyletic clade with the holotype .

Figures

Fig. 3. Basidiomata. A. C. lepidopus HMJAU 48715.B. C. microalbocyaneus HMJAU 48649.C. C. microalbocyaneus HMJAU 48706 (holotype). D. C. neocaninus HMJAU 44495. E. C. neocaninus HMJAU 48691 (holotype). F. C. perrotensis HMJAU 48662. G. C. qilianensis HMJAU 44508 (holotype). H. C. qilianensis HMJAU 48666. Photos by: A–F, H. M.L. Xie; G. S.L. Wei. Scale bars = 20 mm.

Fig. 6. Transmitted light microscopy imaging of basidiospores. A. Cortinarius albocyaneoides HMJAU 48664 (holotype). B. C. albocyaneus HMJAU 44499. C. C. azureovelatus HMJAU 48736. D. C. campanianomalus HMJAU 48748 (holotype). E. C. caninus HMJAU 44372. F. C. epsomiensis HMJAU 44505.G. C. kranabetteri HMJAU 48644.H. C. lepidopus HMJAU 48715.I. C. microalbocyaneus HMJAU 48706 (holotype). J. C. neocaninus HMJAU 48691 (holotype). K. C. perrotensis HMJAU 48662. L. C. qilianensis HMJAU 44508 (holotype). M. C. robustianomalus HMAS 254763 (holotype). N. Cortinarius rufolilacinus HMJAU 48739 (holotype). O. Cortinarius subalbocyaneus HMJAU 48659 (holotype). P. C. subanomalus HMJAU 48752 (holotype). Q. C. subclackamasensis HMJAU 48642. R. C. tabularis HMJAU 44269. S. C. vernalianomalus HMJAU 48770 (holotype). T. C. xizangensis HMAS 274227 (holotype). Photos by M.L. Xie. Scale bars = 10 µm.

Fig. 7. Scanning electron microscopy imaging of basidiospores. A. Cortinarius albocyaneoides HMJAU 48664 (holotype). B. C. albocyaneus HMJAU 44499. C. C. azureovelatus HMJAU 48736. D. C. campanianomalus HMJAU 48748 (holotype). E. C. caninus HMJAU 44372. F. C. epsomiensis HMJAU 44505.G. C. kranabetteri HMJAU 48644.H. C. lepidopus HMJAU 48715.I. C. microalbocyaneus HMJAU 48706 (holotype). J. C. neocaninus HMJAU 48691 (holotype). K. C. perrotensis HMJAU 48662. L. C. qilianensis HMJAU 44508 (holotype). M. C. robustianomalus HMAS 254763 (holotype). N. Cortinarius rufolilacinus HMJAU 48739 (holotype). O. Cortinarius subalbocyaneus HMJAU 48659 (holotype). P. C. subanomalus HMJAU 48752 (holotype). Q. C. subclackamasensis HMJAU 48642. R. C. tabularis HMJAU 44269. S. C. vernalianomalus HMJAU 48770 (holotype). T. C. xizangensis HMAS 274227 (holotype). Photos by M.L. Xie.