Fuscoporia resupinata Q. Chen sp. nov.

Figs 4, 5

Holotype.

China • Yunnan Province, Pu’er, Taiyanghe National Forest Park, on dead angiosperm tree, 17 August 2019, Dai 20455 (BJFC 032123).

Etymology.

Resupinata (Lat.): refers to the species having resupinate basidiomata.

Description.

Basidiomata. Annual, resupinate, inseparable from the substrate, without odor or taste and corky when fresh, rigid when dry, up to 10.6 cm long, 4 cm wide and 1.2 mm thick at center. Pore surface fawn when fresh, snuff brown when dry; sterile margin indistinct, honey-yellow when dry, up to 1 mm wide, paler than color than the pore surface; pores circular to angular, 5–7 per mm; dissepiments thin, entire, abundant setae seen in tube cavities (under lens). Subiculum honey yellow, corky, about 0.2 mm thick. Tubes grayish brown, paler contrasting with pores, rigid, up to 1 mm long.

Hyphal structure. Hyphal system dimitic; generative hyphae simple septate; tissue becoming black in KOH.

Subiculum. Generative hyphae infrequently, thin-walled, frequently branched, simple septate, 1–1.5 μm in diam; skeletal hyphae dominant, yellowish brown, thick-walled with a narrow to medium lumen, unbranched, aseptate, flexuous, strongly interwoven, 3–4 μm in diam.

Tubes. Generative hyphae infrequent, mostly present at subhymenium, hyaline, thin-walled, frequently branched, simple septate, 1–2 μm in diam; skeletal hyphae dominant, yellowish brown, thick-walled with a narrow to medium lumen, unbranched, aseptate, loosely interwoven, 2–5 μm in diam. Setae frequent, mostly originating from hymenium, subulate, dark brown, thick-walled, 20–30 × 5–7 μm; fusoid cystidioles frequent, hyaline and thin-walled, sometimes covered with crystals, 8–12 × 3.5–5 μm; basidia barrel-shaped, with four sterigmata and a simple septum at the base, 16–20 × 6–8 μm; basidioles in shape similar to basidia, but slightly smaller.

Basidiospores. Basidiospores cylindric, hyaline, thin-walled, smooth, usually glued in tetrads, IKI –, CB –, sometimes with guttules, (5.4 –) 5.5–7 (– 7.2) × (2.4 –) 2.5–3 μm, L = 6.38 μm, W = 2.71 μm, Q = 2.29–2.44 (n = 60 / 2).

Additional specimens examined.

China • Yunnan Province, Xinping County, Longquan Park, on fallen angiosperm branch, 16 August 2019, Dai 20422 (BJFC 032090). Malaysia • Selangor, Kota Damansara, Community Forest Reserve, on dead angiosperm tree, 7 December 2019, Dai 21201 (BJFC 032855).