Trechispora crystallina – Facesoffungi number: FoF 12866

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

MycoBank number: MB 559887; Index Fungorum number: IF 559887; Facesoffungi number: FoF 12866;

Description

Basidiomes annual, resupinate, effused, thin, soft and fragile, easily separated from substrates, up to 10 cm long, 2.5 cm wide. Hymenophore grandinioid with numerous small aculei, white to cream when fresh, cream to straw-yellow when dry. Margin white, slightly fimbriate, up to 0.2 mm wide. Hyphal system monomitic; generative hyphae with clamp connections. Subiculum composed of indistinct generative hyphae; subicular hyphae hyaline, thin-walled, frequently branched and septate, interwoven, 2–3.5 µm in diam. Tramal generative hyphae distinct, hyaline, thin-walled, frequently branched, smooth, interwoven, 3–5 μm in diam. Cystidia absent. Crystals occurring in both subiculum and trama, as small, aggregated rhomboidal flakes. Basidia cylindrical with a slight median constriction, hyaline, thin-walled, with four sterigmata and a basal clamp connection, 17–22 × 4–6 µm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores ellipsoid, hyaline, thin to slightly thick-walled, verrucose, inamyloid, indextrinoid, acyanophilous, (3.2–)3.5–4.2(–5) × (2.8–)3–3.6(–3.8) µm, L = 4 µm, W = 3.2 µm, Q = 1.2–1.3 (n = 60/2).

Material examined: VIETNAM, Ho Chi Minh City, Le Thi Rieng Park, on living angiosperm tree, 13 Oct. 2017, L.W. Zhou, LWZ 20171013-7 (holotype in HMAS). CHINA, Inner Mongolia, Tongliao, Daqinggou National Nature Reserve, on fallen angiosperm twig, 29 July 2017, L.W. Zhou, LWZ 20170729-2 (HMAS).

Distribution: VIETNAM, CHINA

Notes: Trechispora crystallina resembles T. cyatheae and T. torrendii by whitish to yellowish, grandinioid hymenophore, thin subiculum and a monomitic hyphal system with thin-walled hyphae (Ordynets et al. 2015, Chikowski et al. 2020). However, T. cyatheae differs in aculeate, smaller basidiospores (3–3.5 × 2–3 µm including spines) and growth exclusively on Cyathea glauca, an endemic species of tree fern to La Réunion, France (Ordynets et al. 2015); and T. torrendii differs in the absence of crystals and aculeate, smaller basidiospores (3.2–3.5 × 2.8–3.2 µm including spines; Chikowski et al. 2020).

Fig. 1. Basidiomes of Trechispora crystallina (LWZ 20171013-7, holotype). — Scale bars: a = 1 cm; b = 0.5 mm.

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