Cortinarius tabularis (Fr.) Fr., Epicr. Syst. Mycol.

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 : 254-256

Cortinarius tabularis (Fr.) Fr., Epicr. Syst. Mycol. (Upsaliae): 284. 1838. Figs 5C, D , 6R , 7R .

Pileus 23–85 mm diam., hemispherical when young, later plano-convex to plane, sometimes with a broad umbo, surface somewhat viscid when young, non hygrophanous, somewhat shiny to distinctly glittery when dry, slight clay greyish yellow to greyish brown. Lamellae emarginate, moderately crowded, slightly greyish blue when young, then greyish brown, edges even. Stipe 50–102 mm long, 3–9 mm thick above, cylindrical to somewhat clavate at the base, surface somewhat shiny, white, with bluish tinges at apex, later greyish yellow, basal mycelium whitish. Universal veil usually sparse, thin, white to yellowish. Context in pileus rather thick, solid, fragile, white at first, bluish in stipe apex, later yellowish. Odour radish. Taste mild. Basidiospores 6.8–8.7(–9.2) × 5.6–6.9 μm, Q = 1.09–1.44, Xav. = 7.4–8.2 × 6.0–6.4 μm, Qav. = 1.21–1.27, broadly ellipsoid, rarely subgloboid, weakly to moderately verrucose. Basidia clavate, 4-spored, hyaline to subhyaline, rarely yellowish to yellowish brown. Lamellar edge fertile. Pileipellis duplex: epicutis well developed, hyphae entangled to interwoven, radially arranged, hyaline to yellowish brown, 3–8 μm wide, smooth to somewhat encrusted; hypocutis well developed, hyphae 12–30 μm wide, hyaline to yellowish, somewhat cellular. Clamp connections present.

Ecology and distribution: Known from northeast China in Betula platyphylla forests or mixed with Larix gmelinii , and from east China under broadleaf. Also widespread in Europe and in North America from northern Quebec and Alaska under broadleaf and mixed forests including Picea , Betula , Alnus , Salix , Quercus , and Fagus .

Specimens examined: China, Heilongjiang Province, Mohe County, Gulian Forest Farm, in Betula platyphylla forest, alt. 550 m, 25 Aug. 2016, M.L. Xie, A. Ma & J.J. Hu, HMJAU 44248, HMJAU 44249; Qianshao Forest Farm, in mixed forest of Betula platyphylla and Larix gmelinii , alt. 490 m, 26 Aug. 2016, M.L. Xie, A. Ma & J.J. Hu, HMJAU 44269; Inner Mongolia Autonomous Region, Genhe County, Mangui Town, Ningcuishan Park, in mixed forest of Larix gmelinii and Betula platyphylla , alt. 820 m, 25 Aug. 2017, M.L. Xie & Y. Wang, HMJAU 44484; Jinhe Town, in mixed forest of Larix gmelinii and Betula platyphylla , alt. 820 m, 25 Aug. 2018, M.L. Xie, HMJAU 44506; Zhejiang Province, Xihu District, Hangzhou Botanical Garden, in broadleaf, 7 Apr. 2023, Q.Q. Huang, HMAS 287406.

Notes: Cortinarius tabularis is a greyish brown species, without bluish tinges except at the lamellae and stipe apex. The whitish stipe is often with sparse universal veil. The basidiospores are broadly ellipsoid. It is reported as a common and widespread species in China ( Zang 1996, Wu et al. 2011), but our studies show that it is a rare species, and only occurs in Heilongjiang, Inner Mongolia and Zhejiang. The distribution of this species in China requires further confirmation. The most closely related species of C. tabularis is Cortinarius sp 11 from which it differs by seven substitutions and indel positions in the nrITS region, with a similarity of 98.8 %.

Figures

Fig. 5. Basidiomata. A. C. subclackamasensis HMJAU 48642. B. C. subclackamasensis HMJAU 48718. C. C. tabularis HMJAU 44269. D. C. tabularis HMAS 287406. E. C. vernalianomalus HMJAU 48770 (holotype). F. C. vernalianomalus HMAS 287405. G, H. C. xizangensis HMAS 274227 (holotype). Photos by: A–C. M.L. Xie; D. Q.Q. Huang; E. L.L. Qi; F. Q. Yang; G, H. T.Z. 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.