Physisporinus yunnanensis C.L. Zhao, 2023

Cai, Jia, Zou, Lei, Wu, Xi & Zhao, Chang-Lin, 2023, Physisporinus yunnanensis sp. nov. (Polyporales, Basidiomycota) from Southern China, Phytotaxa 579 (2), pp. 98-106 : 102

Physisporinus yunnanensis C.L. Zhao , sp. nov. Figs. 2 , 3

MycoBank no.: MB 846536

Etymology:— yunnanensis (Lat.) refers to the location “ Yunnan Province ” where the type specimen was collected.

Holotype:— CHINA. Yunnan Province, Lijiang, Yulong County, Black Dragon Pool Park , E 100°13′57′′, N 26°53′15′′, elev. 2417 m, on the stump of angiosperm, 21 July 2021, CLZhao 21647 ( SWFC).

Fruiting body:— Basidiomata annual, resupinate, soft to juicy when fresh, without odor or taste, bone hard when dry, up to 3 cm long, 2.5 cm wide and 0.5 mm thick at centre. Pore surface olivaceous when fresh, olivaceous to black when dry, slightly staining when touched or bruised; sterile margin narrow, up to 1 mm wide; pores round, shallow, 2–3 per mm; dissepiments thin, entire. Subiculum very thin to almost lacking, olivaceous to brown, hard corky. Tubes concolourous with the pore surface, bone hard, up to 0.4 mm long.

Hyphal structure: — Hyphal system monomitic; generative hyphae with simple septa, IKI-, CB+; tissues unchanged in KOH.

Subiculum: — Subicular generative hyphae colorless, thin to slightly thick-walled, occasionally branched, more or less straight, regularly arranged, 4–6 µm in diam.

Hymenium : — Tramal generative hyphae colorless, thin to slightly thick-walled, moderately branched, interwoven, 3.5–5.5 µm in diam; cystidia larger, strongly encrusted, colorless, thin-walled, 30–76 × 5–8.5 µm; basidia mostly short clavate to barrel-shaped, thin-walled, smooth, with four sterigmata and a simple basal septum, 8–11.5 × 5.5–7 µm (x̅ = 9.8 × 6.3 µm); basidioles in shape similar to basidia, but smaller.

Basidiospores: — Subglobose, colorless, thin-walled, smooth, bearing a larger guttule, IKI-, CB-, 4–5.5 × 3.5–5 µm, L = 4.5 µm, W = 4 µm, Q = 1.04–1.08 (n = 60/2).

Additional specimens examined: — CHINA. Yunnan Province, Lijiang, Yulong County, Black Dragon Pool Park , E 100°13′57′′, N 26°53′15′′, elev. 2417 m, on the stump of angiosperm, 21 July 2021, CLZhao 21583 ( SWFC) .

Habitat and ecology: —Climate of the sample collection site is monsoon humid, and the forest type is evergreen broad-leaved forest, and the samples were collected on an angiosperm stump.

Figures

FIGURE 2. Basidiomata of Physisporinus yunnanensis. Bars:A = 1 cm, B = 1 mm (Holotype: CLZhao 21647). Photoplate by: Jia Cai.

FIGURE 3. Microscopic structures of Physisporinus yunnanensis (drawn from the holotype, CLZhao 21647). A: Basidiospores. B: Basidia and basidioles. C: Cystidioles. D: Cystidia and hypha-like cystidia. E: Hyphae from subiculum. F: Hyphae from trama. Bars: A = 5 µm; B–F = 10 µm. Drawings by: Jia Cai.