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

Figs 3 , 4

Holotype.

China • Yunnan Province, Kunming, Panlong District, Yeyahu Forest Park , 25 ° 13 ' N, 102 ° 87 ' E, altitude 2125 m, on the angiosperm trunk, leg. C. L. Zhao, 30 September 2019, CLZhao 14056 ( SWFC).

Etymology.

Olivaceobasidiosa (Lat.): refers to the olivaceous basidiomata.

Description.

Basidiomata annual, resupinate, separable from the substrate, arachnoid, without odour or taste when fresh, and up to 3 cm long, 2.5 cm wide, 0.3–0.6 mm thick. Hymenial surface smooth, slightly olivaceous when fresh, olivaceous to slightly brown upon drying. Sterile margin narrow, olivaceous, up to 1 mm.

Hyphal system: Monomitic; generative hyphae with clamp connections, pale brown, slightly thick-walled, moderately branched, interwoven, 3.5–5 µm in diameter. IKI –, CB –; brown-black to black in KOH.

Hymenium: Cystidia and cystidioles absent. Presence of crystals amongst generative hyphae. Basidia clavate, with 4 sterigmata and a basal clamp connection, 39–48.5 × 7–8.5 µm, basidiole clavate, slightly smaller than basidia.

Spores: Basidiospores subglobose to globose, nodulose to verrucose, yellowish-brown, thick-walled, IKI –, CB –, (6.5 –) 7–9 (– 9.5) × (5 –) 6–7.5 (– 8.5) µm, L = 8.4 µm, W = 7 µm, Q = 1.20–1.23 (n = 60 / 2).

Additional specimen examined (paratype): China. Yunnan Province, Kunming, Panlong District, Yeyahu Forest Park, GPS coordinates: 25 ° 13 ' N, 102 ° 87 ' E, elev. 2125 m, on the angiosperm trunk, leg. C. L. Zhao, 30 September 2019, CLZhao 14051 ( SWFC).

Figures

Figure 3. Tomentella olivaceobasidiosa (holotype, CLZhao 14056): basidiomata on the substrate (A), macroscopic characteristics of hymenophore (B). Scale bars: 1 cm (A); 1 mm (B).

Figure 4. Microscopic structures of Tomentella olivaceobasidiosa (holotype, CLZhao 14056): basidiospores (A), basidia and basidioles (B), a section of the hymenium (C). Scale bars: 10 µm (A – C).