Trechispora xantha

Trechispora xantha C.L. Zhao

MycoBank no.: MB 838160

Basidiomata annual, resupinate, without odor or taste when fresh, becoming hard corky up on drying, up to 17 cm long, 3 cm wide, 20–60 μm thick. Hymenial surface smooth, cracking, slightly buff (13:4A4) when fresh, becoming darker yellowish (22:4A4) upon drying. Subiculum very thin, pale buff (13:4A4). Margin narrow, pale buff (13:4A4). Hyphal system monomitic; generative hyphae with clamp connections, IKI–, CB–; tissues unchanged in KOH. Subiculum composed of colorless, thin-walled, frequently branched, long generative hyphae, 2–3.5 μm in diam., ampullate hyphae frequently present. Subhymenial composed of colorless, thin-walled, rarely branched, short generative hyphae, 1.5–3.5 μm in diam.; cystidia and cystidoles absent; basidia subcylindrical to subclavate, 14.5–23 × 4.5–7.5 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–, (4–)4.3–5.7(–6) × (3–)3.2–4(–4.3) μm, L = 4.97 μm, W = 3.64 μm, Q = 1.32–1.41 (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, 1 August 2019, CLZhao 17781 (SWFC!), GenBank No. (ITS MW302340; nLSU MW293869).

Fig. 1 Maximum Parsimony strict consensus tree illustrating the phylogeny of two new species and related species in Trechispora 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. The new species are in bold.