Xylodon wumengshanensis Q. Yuan & C. L. Zhao, 2024

Yuan, Qi & Zhao, Changlin, 2024, Morphology and multigene phylogeny revealed four new species of Xylodon (Schizoporaceae, Basidiomycota) from southern China, MycoKeys 107, pp. 161-187 : 161-187

Xylodon wumengshanensis Q. Yuan & C. L. Zhao sp. nov.

Figs 10 , 11

Holotype.

China. Yunnan Province, Zhaotong, Wumengshan National Nature Reserve , GPS coordinates 27 ° 77 ' N, 104 ° 29 ' E, altitude 2900 m, on the fallen branch of angiosperm, leg. C. L. Zhao, 29 August 2023, CLZhao 32517 ( SWFC).

Etymology.

wumengshanensis (Lat.) : referring to the locality (Wumengshan) of the type specimen.

Description.

Basidiomata annual, resupinate, adnate, coriaceous, without odour and taste when fresh and up to 4.5 cm long, 1.5 cm wide, 100–200 µm thick. Hymenial surface grandinoid, cream when fresh; turn to cream to buff upon drying. Sterile margin distinct, cream, up to 1 mm wide.

Hyphal system monomitic, generative hyphae with clamp connections, colourless, thick-walled, rarely branched, 2–3.5 µm in diameter; IKI –, CB –, tissues unchanged in KOH.

Cystidia of two types: (1) capitate, colourless, thin-walled, smooth, slightly constricted at the neck, with a globose head, 24.5–29.5 × 5–6 µm; (2) fusoid, colourless, thin-walled, smooth, 14.5–22 × 5.5–6.5 µm; basidia clavate, with 4 sterigmata and a basal clamp connection, 22.5–33 × 5–5.5 µm.

Basidiospores ellipsoid, colourless, thin-walled, smooth, with one oil drop, CB –, IKI –, (4.5 –) 5–6.5 (– 7) × 4–5.5 µm, L = 5.55 µm, W = 4.39 µm, Q = 1.26 (n = 30 / 1).

Figures

Figure 10. Basidiomata of Xylodon wumengshanensis (holotype). Scale bars: 1 cm (A); 2 mm (B).

Figure 11. Microscopic structures of Xylodon wumengshanensis (holotype): basidiospores (A), basidia (B), basidioles (C), fusoid cystidia (D), capitate cystidia (E), a section of hymenium (F). Scale bars: 20 µm (A – F).