Erioscyphella baimana L. Luo, K. D. Hyde & Q. Zhao 2025, sp. nov.

Erioscyphella baimana L. Luo, K. D. Hyde & Q. Zhao sp. nov. Fig. 3 Etymology. The epithet “ baimana ” refers to the collection site, Baima Mountain, where the holotype specimen was collected. Holotype. HKAS 135697. Description. Saprobic on dead twigs. Sexual morph: Apothecia superficial, gregarious, 0.3–1.1 mm in diameter, 0.3–1.4 mm high when dry, discoid to cupulate, long stipitate, externally covered with short, white hairs. Disc concave, surface slightly smooth, yellow. Margin flat to slightly involute, white, covered with white hairs. Receptacle cupulate to discoid, white, covered entirely with short, white hairs. Stipe 0.2–0.6 mm in diameter, 0.3–1.1 mm long when dry, cylindrical, solitary, white, clothed with white hairs. Hairs 30–120 × 2.8–4.7 µm (x ̄ = 74 × 3.7 µm, n = 30), clavate to cylindrical, straight to slightly curved, aseptate, hyaline, thin-walled, covered with fine granules, obtuse apex, lacks apical amorphous. Hymenium 165–230 µm (x ̄ = 195 µm, n = 12), concave, surface slightly smooth, yellow in dry. Medullary excipulum 35–120 µm (x ̄ = 70 µm, n = 18), thin, hyaline, thin-walled cells of textura porrecta, 1.3–3.8 µm (x ̄ = 2.5 µm, n = 50) in diameter. Ectal excipulum 40–120 µm (x ̄ = 68 µm, n = 18) thin, thin-walled, smooth, light yellowish cells of textura porrecta to oblita, 1.9–6.3 µm (x ̄ = 4.1 µm, n = 60) in diameter. Paraphyses 95–170 × 1.2–2.5 µm (x ̄ = 140 × 1.6 µm, n = 25), longer than asci, filiform, straight to slightly curved, aseptate, hyaline, light smooth, with slightly obtuse apex. Asci 100–152 × 3.6–9.5 µm (x ̄ = 123 × 7.2 µm, n = 34), 8 - spored, unitunicate, clavate, straight to slightly curved, inoperculate, hyaline, slightly smooth, with an apical, amyloid pore and rounded ends, J + in MLZ, tapered long stipitate base. Ascospores (85 / 7 / 2) (29.5 –) 30.5–37.5 (– 40.0) × 2.2–5.0 (– 5.5) µm, (x ̄ = 32.9 × 4.1 µm, n = 85), biseriate, fusoid-clavate with blunt ends, fusiform, 1–3 - septate, thin-walled, hyaline, slightly smooth, tapering towards the obtuse ends, with longitudinal striations, without oil guttules. Asexual morph: Not observed. Material examined. China • Yunnan Province, Diqing City, Deqin County, Baima Mountain, altitude 3485 m, on the decayed unidentified twig, 21 July 2022, Le Luo, Ly 7 (HKAS 135697, holotype); • ibid., Le Luo, Ly 26 (HKAS 135696, isotype). Notes. Our specimens, HKAS 135697 and HKAS 135696, were grouped in a distinct clade, separated from E. latispora by 99 % MLBS and 1.00 BIPP (Fig. 1). Our species, E. baimana, morphologically differs from E. latispora by having aseptate hairs, ascospores without oil guttules whereas the latter species possess septate hairs, asci with rounded to subconical apex, and ascospores with four or more large guttules. Therefore, E. baimana is introduced here as a new species.