Trechispora constricta – Facesoffungi number: FoF 12865

Trechispora constricta S.L. Liu, S.H. He & L.W. Zhou

MycoBank number: MB 559886; Index Fungorum number: IF 559886; Facesoffungi number: FoF 12865;

Description

Basidiomes annual, resupinate, effused, thin, soft, easily separated from substrates, up to 3 cm long, 2 cm wide. Hymenophore odontioid, white to cream when fresh, cream to buff-yellow with age, not cracked. Aculei 5–8 per mm, up to 0.5 mm long. Margin thinning out as byssoid, white. Hyphal system monomitic; generative hyphae with clamp connections. Subicular hyphae hyaline, thin-walled, moderately branched, septate, subparallel, 3–6 µm in diam. Tramal generative hyphae distinct, hyaline, thin-walled, moderately branched, smooth, subparallel, 3–6 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, 11–15 × 4–5.5 µm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores ellipsoid, hyaline, thin-walled, aculeate, with a slight constriction in the middle-upper part of spines, inamyloid, indextrinoid, acyanophilous, 3–4 × 2.3–2.9(–3) µm, L = 3.4 µm, W = 2.6 µm, Q = 1.3 (n = 60/2).

Material examined: CHINA, Jiangxi, Fenyi County, Dagangshan Nature Reserve, on rotten angiosperm wood, 19 Sept. 2008, Y.C. Dai, Dai 10534 (holotype in BJFC 004783).

Distribution: CHINA

Notes: Trechispora constricta is characterized by wide generative hyphae (3–6 µm in diam) and aculeate basidiospores with a slight constriction in the middle-upper part of spines (Fig. 18). Trechispora constricta resembles T. tropica (described below), but the latter species differs also in smaller basidiospores (2.5–3 × 2.2–2.5 µm) besides lack of a constriction on the spines of basidiospores.

Fig. 1. Basidiomes of Trechispora constricta (Dai 10534, holotype). — Scale bars: a = 1 cm; b = 1 mm.

Fig. 2. Microscopic structures of Trechispora constricta (drawn from the holotype). a. Vertical section of basidiomes; b. Basidiospores. — Scale bar = 10 μm.