Botryobasidium latihyphum Xin Li, Y. J. Cui & Y. D. Wu, 2025

Botryobasidium latihyphum Xin Li, Y. J. Cui & Y. D. Wu sp. nov.

Figs 2 View Figure 2 , 3 View Figure 3

Holotype.

China • Xizang Autonomous Region., Linzhi, Metuo County, the road 219 from Metuo to Bome , on fallen trunk of Abies , 25 October 2023, Dai 26858 ( BJFC 044409 About BJFC ).

Etymology.

Latihyphum refers to the characteristic wide subicular hyphae of the new species.

Description.

Basidiomata: Annual, resupinate, adnate, hypochnoid, difficult to separate from substrate, up to 10 cm long, 4 cm wide, 1 mm thick at center, without odor and taste when fresh and dry; hymenophore white to cream when fresh, smooth, uncracked, cream to olivaceous buff when dry; sterile margin indistinct, thinning out, concolorous with hymenophore.

Hyphal system: Monomitic, clamp connections present, generative hyphae CB +, IKI –; tissues unchanged in KOH; subhymenial hyphae slightly thick-walled, smooth, frequently branched at right angles, loosely interwoven, 5–7 µm in diam.; subicular hyphae thick-walled, smooth, frequently branched, 7–10 µm in diam.

Hymenium: Cystidia clavate to tubular, infrequent, smooth, thin-walled, colorless, with a basal clamp connection, aseptate, CB +, IKI –, unchanged in KOH, 56–105 × 7–10 μm; basidia slightly barrel-shaped, thin-walled, with six sterigmata and a clamp connection at the base, 17–25 × 6–8.5 μm; basidioles in shape similar to basidia, but slightly smaller.

Spores: Basidiospores oval, hyaline, thin-walled, smooth, CB +, IKI –, (7.0 –) 7.9–10.2 (– 10.3) × (3.1 –) 3.2–4.3 (– 4.4) um, L = 8.78 um, W = 3.64 um, Q = 2.41 (n = 60 / 2).