Hymenochaete sinensis Y.C. Li & C.L. Zhao, 2024

Li, Yunchao, Chen, Minglan, Xiao, Wenyuan, Zhang, Junzhong & Zhao, Changlin, 2024, Molecular phylogeny and morphology reveal a new Hymenochaete species (Hymenochaetaceae, Basidiomycota) from China, Phytotaxa 664 (3), pp. 159-171 : 163-165

Hymenochaete sinensis Y.C. Li & C.L. Zhao , sp. nov. Figures 1 and 2 .

MycoBank no.: MB 854216

Etymology:— sinensis (Lat.) : refers to the country ( China) where the type specimen was collected.

Holotype: — China. Yunnan Province, Qujing, Qilin District, Cuishan Forest Park , GPS coordinates: 25°55′ N, 103°69′ E, altitude: 2245 m, on a fallen branch of angiosperm, leg. C.L. Zhao, 5 November 2022, CLZhao 26040 ( SWFC) .

Basidiomata: —Annual, resupinate, closely adnate, ceraceous, without odor or taste, at first as small irregular patches up, later confluent up to 11 cm long, 2.5 cm wide, and 0.3 mm thick. Hymenial surface aurantium to coconut brown when fresh, coconut brown to brownish black upon drying. Sterile margin thinning, aurantium, up to 1 mm.

Hyphal system: —Monomitic; generative hyphae with simple-septate, colorless, distinctly thick-walled, frequently branched, interwoven, 2.5–3.5 µm in diameter; IKI–, CB–, tissues unchanged in KOH.

Hymenium: —Cystidia absent, cystidioles abundant, fusiform, slightly sinuous, colorless, thin-walled, 17–21 × 4.2–4.9 µm. Basidia barrelled, colorless, thin-walled, with four sterigmata and a basal simple septum, 10–12 × 3.1–3.8 µm; basidioles dominant, in shape similar to basidia, but slightly smaller. Setae abundant, distinctly thick-walled, subulate, with an acute tip, yellowish to reddish brown, 49–63 × 6.7–7.5 µm, projecting out of the hymenium up to 36 µm.

Spores: —Basidiospores ellipsoid to broadly ellipsoid, colorless, distinctly thick-walled, smooth, IKI–, CB–, 4–5 × 2.5–3.5 µm, L = 4.20 µm, W = 3.20 µm, Q = 1.31 (n = 30/1).

Additional specimens examined (paratypes): — China. Yunnan Province, Qujing, Qilin District, Cuishan Forest Park , GPS coordinates: 25°55′ N, 103°69′ E, altitude: 2245 m, on the fallen branch of angiosperm, leg. C.L. Zhao, 5 November 2022, CLZhao 26652 , 13 April 2024, CLZhao 35894 ( SWFC) .

Figures

FIGURE 1. Maximum parsimony strict consensus tree illustrating the phylogeny of one new species and related species in Hymenochaete based on ITS+nLSU sequences. The branch is labeled with a maximum likelihood lead value equal to or greater than 70%, a reduced lead value equal to or greater than 50%, and a Bayesian posterior probability equal to or greater than 0.95. The red star represents the type species. The new species is in black bold.

FIGURE 2. Maximum parsimony strict consensus tree illustrating the phylogeny of one new species and related species in Hymenochaete based on ITS sequences. The branch is labeled with a maximum likelihood lead value equal to or greater than 70%, a reduced lead value equal to or greater than 50%, and a Bayesian posterior probability equal to or greater than 0.95. The red star is the type species. The new species is in black bold.