Trechispora daweishanensis

Trechispora daweishanensis C.L. Zhao

MycoBank no.: MB 838158

Basidiomata annual, adnate, resupinate, without odor or taste when fresh, becoming membranous upon

drying, up to 8 cm long, 2.5 cm wide, 30–70 μm thick. Hymenial surface tuberculate, white when fresh, turn to white (60) to cream (21:4A2/3) to buff (13:4A4) upon drying. Subiculum very thin, white. Margin sterile, white (60), 0.3 cm wide. Hyphal system monomitic; generative hyphae with clamp connections, IKI–, CB–; tissues unchanged in KOH. Subiculum composed of colorless, thin-walled long, generative hyphae rarely branched, 1–2.5 μm in diam., ampullate hyphae encrusted with numerous larger crystals.

Subhymenium composed of colorless, thin-walled, shorter generative hyphae rarely branched, 1.5–3.5 μm in diam., many crystals present; cystidia and cystidoles absent; basidia subcylindric to shortly clavate, 9.5–14.5 × 4–7 μm, four-spored and with a basal clamp connection; basidioles dominant, in shape similar to basidia, but slightly smaller. Basidiospores ellipsoid, colorless, thin-walled, smooth, with oil drops, IKI–, CB–, (3.5–)3.8–5(–5.2) × (2.5–)2.7–3.5(–3.7) μm, L = 4.46 μm, W = 3.10 μm, Q = 1.41–1.44 (n = 60/2).

Additional specimen (paratype) examined: CHINA. Yunnan Province, Honghe, Pingbian County, Daweishan National Nature Reserve, E 103°30′10′′, N 23°42′07′′, alt. 1500 m, on fallen angiosperm branch, 2 August 2019, CLZhao 18255 (SWFC!), GenBank No. (ITS MW302338; nLSU MW293867).

Fig. 1 Maximum Parsimony strict consensus tree illustrating the phylogeny of two new species of Trechispora and related species in Trechisporales based on ITS+nLSU sequences. Branches are labeled with maximum likelihood bootstrap values higher than 70%, parsimony bootstrap values higher than 50% and Bayesian posterior probabilities more than 0.95.