Trechispora latehypha S.L. Liu, S.H. He & L.W. Zhou.
MycoBank number: MB 559893; Index Fungorum number: IF 559893; Facesoffungi number: FoF 12873;
Basidiomes annual, resupinate, effused, thin, soft, fragile, inseparable from substrate, up to 15 cm long, 4 cm wide. Hymenophore smooth, arachnoid, white to cream when fresh, cream to buff-yellow with age, finely cracked with age. Margin white, thinning out as byssoid, 1 mm wide. Hyphal system monomitic; generative hyphae with clamp connections. Subicular hyphae long-celled, hyaline, slightly thick-walled to thick-walled, moderately branched and septate, subparallel, 3.5–6 µm in diam. Subhymenial hyphae short-celled and wide, hyaline, thin-walled, 4.5–7 µm in diam, much branched. Cystidia absent. Basidia cylindrical with a slight median constriction, hyaline, thin-walled, with four sterigmata and a basal clamp connection, 13–16 × 4–5.5 µm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores ellipsoid, hyaline, thin-walled, aculeate, inamyloid, indextrinoid, acyanophilous, (2.9–)3–3.5(–3.8) × (2.2–)2.4–2.9(–3) µm, L = 3.2 µm, W = 2.6 µm, Q = 1.2 (n = 60/2).
Material examined: CHINA, Guangdong, Renhua County, Danxiashan National Nature Reserve, on fallen angiosperm trunk, 4 June 2019, S.H. He, He 5848 (holotype in BJFC 030723).
Notes: Trechispora latehypha is similar to T. larssonii by more or less smooth hymenophoral configuration and rows of short-celled and wide subhymenial hyphae. However, T. larssonii has thin-walled subicular hyphae and verrucose basidiospores. Trechispora farinacea also resembles T. latehypha by short-celled and wide subhymenial hyphae, but differs in more or less grandinioid to nearly hydnoid hymenophore, and subglobose to broadly ellipsoid basidiospores (Larsson 1995). In addition, T. farinacea is a common species in the north temperate zone, especially in Europe (Bernicchia & Gorjón 2010), whereas T. latehypha is only known in southern China.
Fig. 1. Basidiomes of Trechispora latehypha (He 5848, holotype). — Scale bars: a = 1 cm; b = 2 mm.
Fig. 2. Microscopic structures of Trechispora latehypha (drawn from the holotype). a. Vertical section of basidiomes; b. Basidiospores. — Scale bar = 10 μm.