Adustochaete punctata J. H Dong & C. L. Zhao sp. nov.

Figs 7, 8, 9

Diagnosis.

Differs from other Adustochaete species by its membranaceous basidiomata with cream, smooth, punctate hymenial surface, a monomitic hyphal system with clamped generative hyphae and subcylindrical to allantoid basidiospores measuring 13.5–18 × 6–8.2 µm.

Holotype.

China • Yunnan Province, Dehong, Yingjiang County, Tongbiguan Provincial Nature Reserve, 23 ° 48 ′ N, 97 ° 38 ′ E, altitude 1500 m, on the fallen branch of angiosperm, leg. C. L. Zhao, 17 July 2023, CLZhao 29675 (SWFC).

Etymology.

punctata (Latin or Greek origin): referring to the punctate hymenial surface of the specimen.

Basidiomata.

Annual, resupinate, closely adnate, membranaceous, very hard to separate from substrate, without odour or taste when fresh, becoming coriaceous upon drying, up to 10 cm long, 1.5 cm wide, 100–250 µm thick. Hymenial surface smooth, punctate, white to cream when fresh, turning to cream upon drying. Sterile margin cream, thinning out, up to 1 mm wide.

Hyphal system.

Monomitic, generative hyphae with clamp connections, colourless, thin-walled, unbranched, interwoven, 1.5–3.5 µm in diameter; IKI –, CB –, tissues unchanged in KOH. Hymenium. Cystidia numerous, thin-walled, subcylindrical to clavate with an obtuse apex, occasionally sinuous in the basal, 15.5–23.5 × 5.5–7.5 µm, with a clamp connection at base; cystidioles absent. Hyphidia arising from generative hyphae, nodulose, branched, colourless, thin-walled, 1.5–5 μm in diameter. Basidia ellipsoid to ovoid, longitudinally septate, two to four-celled, 17–25 × 16.5–21 µm; basidioles dominant, similar to basidia in shape, but slightly smaller. Basidiospores. Subcylindrical to allantoid, slightly curved, colourless, smooth, thin-walled, with several oil drops, IKI –, CB –, (13 –) 13.5–18 (– 18.5) × (5.5 –) 6–8.2 (– 8.5) µm, L = 15.78 µm, W = 6.79 µm, Q = 2.15–2.40 Q m = 2.32 ± 0.08 (n = 90 / 3).

Additional specimens examined.

China • Yunnan Province, Dehong, Yingjiang County, Tongbiguan Provincial Nature Reserve, 23 ° 48 ′ N, 97 ° 38 ′ E, altitude 1500 m, on the fallen branch of angiosperm, leg. C. L. Zhao, 17 July 2023, CLZhao 29669; CLZhao 29671; CLZhao 29685; CLZhao 29686; CLZhao 29706; CLZhao 29710; CLZhao 29711 (SWFC).