Trechispora malayana S.L. Liu, S.H. He & L.W. Zhou
MycoBank number: MB 559895; Index Fungorum number: IF 559895; Facesoffungi number: FoF 12875;
Basidiomes annual, resupinate, effused, thin, soft, fragile, easily separated from substrates, up to 10 cm long, 5 cm wide. Hymenophore hydnoid, cream to buff-yellow with age. Aculei white when fresh, 5–6 per mm, up to 0.8 mm long. Margin thinning out as byssoid, white, up to 1.5 mm wide. Mycelial cords present, white, 0.5 mm wide. Hyphal system monomitic; generative hyphae with clamp connections. Subicular hyphae hyaline, thin-walled, frequently branched and septate, subparallel to interwoven, 1.5–4 µm in diam. Tramal generative hyphae distinct, hyaline, thin-walled, frequently branched, smooth, subparallel to interwoven, 2–4 μm in diam. Cystidia absent. Crystals usually present, bipyramidic, aggregated. Basidia cylindrical with a slight median constriction, hyaline, thin-walled, with four sterigmata and a basal clamp connection, 20–28 × 4–5 µm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores ellipsoid, hyaline, thin-walled, aculeate, inamyloid, indextrinoid, acyanophilous, 3.3–4.1(–4.5) × (2.3–)2.5–3(–3.5) µm, L = 3.8 µm, W = 2.9 µm, Q = 1.3–1.4 (n = 60/2).
Material examined: SINGAPORE, Bukit Timah Nature Reserve, on rotten angiosperm wood, 20 July 2017, Y.C. Dai, Dai 17876 (holotype in BJFC 025408).
Notes: Trechispora malayana may be confused with T. nivea, but T. nivea differs in slightly thick-walled tramal hyphae and shorter spines on basidiospores (up to 0.3 µm in length; Larsson 1995).
Fig. 1. Basidiomes of Trechispora malayana (Dai 17876, holotype). — Scale bars: a = 1 cm; b = 1 mm.
Fig. 2. Microscopic structures of Trechispora malayana (drawn from the holotype). a. Vertical section of basidiomes; b. Basidiospores. — Scale bar = 10 μm.