Tomentella velutina X. J. Zhang & C. L. Zhao, 2024

Zhang, Xiaojie, Shi, Fulei, Yang, Ke & Zhao, Changlin, 2024, The diversity and taxonomy of Tomentella (Thelephoraceae, Thelephorales) with descriptions of four new species from Southwestern China, MycoKeys 109, pp. 1-29 : 1-29

Tomentella velutina X. J. Zhang & C. L. Zhao sp. nov.

Figs 5 , 6

Holotype.

China • Yunnan Province, Lincang , Fengqing County, 24 ° 66 ' N, 100 ° 19 ' E, altitude 2060 m, on the fallen branch of angiosperm, leg. C. L. Zhao, 22 October 2022, CLZhao 25474 ( SWFC).

Etymology.

Velutina (Lat.): refers to the velvety hymenophore of the type specimen.

Description.

Basidiomata annual, resupinate, adnate, cotton to floccose, without odour and taste when fresh and up to 4.5 cm long, 3 cm wide, 0.3–0.5 mm thick. Hymenial surface cotton to floccose, fawn to reddish brown when fresh, turn reddish brown to vinaceous brown when dry. Sterile margin narrow, fawn to reddish brown, up to 2 mm.

Hyphal system: Monomitic; generative hyphae with clamp connections, yellowish-brown, slightly thick-walled, 3–7 mm in diameter, IKI –, CB –, brown-black to black in KOH.

Hymenium: Cystidia and cystidioles absent. Basidia clavate, colourless, with 4 sterigmata and a basal clamp connection 36–42.5 × 7–8 µm.

Spores: Basidiospores broadly ellipsoid, yellowish-brown, thick-walled, ornamented, with 1–2 oil drops, CB –, IKI –, 7–9 × (5.5 –) 6–7.5 µm, L = 7.82 µm, W = 6.71 µm, Q = 1.16 (n = 30 / 1).

Figures

Figure 5. Tomentella velutina (holotype, CLZhao 25474): basidiomata on the substrate (A), macroscopic characteristics of hymenophore (B). Scale bars: 1 cm (A); 1 mm (B).

Figure 6. Microscopic structures of Tomentella velutina (holotype, CLZhao 25474): basidiospores (A), basidia and basidioles (B), a section of the hymenium (C). Scale bars: 10 µm (A – C).