Ramaria xizangensis C. L. Zhao & H. M. Zhou sp. nov.

Figs 11, 12

Holotype.

China, Xizang, Linzhi, Sejila Mountain National Forest Park, 29 ° 64 ' N, 94 ° 71 ' E, elev. 3850 m, gregarious on the humus under Abies, 2 August 2023, CLZhao 31169 (SWFC).

Etymology.

Xizangensis (Lat.): refers to the locality (Xizang) of the type specimens.

Diagnosis.

Differed from other species in having flesh pink basidiomata, monomitic hyphal system, generative hyphae with clamp connections, ellipsoid to cylindrical, densely warted basidiospores (9.7–11.8 × 3.9–4.9 µm).

Fruiting body.

Basidiomata solitary to gregarious, with 8 cm high × 6 cm wide at the widest point, repeat branched dichotomously in 4–5 ranks, flesh pink when fresh, become clay buff with dry; apices obtuse, orange yellow when fresh, becoming fuscous when dry. Stipe ≥ 3 cm high, compound to fasciculate in groups of 5, emerging from a common base, concolorous with the branches.

Hyphal structure.

Hyphal system monomitic, generative hyphae with clamp connections, branched, walls smooth and hyaline; basal stem with tramal hyphae 4–7 μm wide and inflated ones up to 10 μm, occasionally branched, thin-walled, parallel arranged, hyaline; tramal hyphae of branches 3–4 μm wide.

Hymenium.

Hymenium all along the basidiomata. Basidia clavate, in a dense palisade, with 4 sterigmata and a basal clamp connection. Basidioles elongated clavate, smooth, hyaline, contents homogeneous, 23.5–34 × 6–7 μm.

Spores.

Basidiospores ellipsoid to cylindrical, densely warted, with 1–2 several guttulae, IKI –, CB –, 9.7–11.8 (– 12.5) × (3.8 –) 3.9–4.9 (– 5.1) µm, L = 10.69 µm, W = 4.29 µm, Q = 2.49 (n = 30 / 1).

Additional specimens examined

(paratypes). China, Xizang, Linzhi, Sejila Mountain National Forest Park, 29 ° 67 ' N, 94 ° 74 ' E, elev. 3850 m, gregarious on the humus under Abies, 2 August 2023, CLZhao 31180 (SWFC); on ground in forest of Abies, 2 August 2023, CLZhao 31204 (SWFC).