Stereopsis yunnanensis Q. Yuan & C.L. Zhao, 2023

Yuan, Qi, Luo, Kai-Yue, Zhang, Ying & Zhao, Chang-Lin, 2023, Morphological characteristics and phylogenetic analyses revealed three new wood-inhabiting fungi (Agaricomycetes, Basidiomycota) in Southern China, Phytotaxa 592 (3), pp. 179-195 : 188-189

Stereopsis yunnanensis Q. Yuan & C.L. Zhao , sp. nov. Figs. 5 , 6

MycoBank no.: MB 846983

Holotype:— CHINA, Yunnan Province, Puer, Jingdong County, Kongqueshan Forestry Park , E 100°08′, N 24°04′, elev. 3002 m, on dead bamboo, 3 October 2017, CLZhao 3767 ( SWFC).

Etymology:— yunnanensis (Lat.) —refers to the locality (Yunnan Province) of the type specimens.

Fruiting body:— Annual, laterally stipitate, gregarious. Pilei medium-sized, infundibuliform, brittle when fresh, hard on drying, up to 3 cm long, 4 cm wide, 1.5 mm thick; fawn to isabelline when fresh, greyish brown to brown on drying; proliferous from a central common base, usually with several laterally confluent spathulate to flabelliform or valves; the surface radially striate; margin thin, wavy. Hymenial surface stereoid, buff to clay-buff when fresh, clay-buff to slightly brown on drying. Stipe cylindrical, up to 2 cm long, up to 1 cm in diameter. Context leathery in fresh condition, corky to leathery in dried condition, up to 1 mm thick at the thickest portion of pileus, thinner at margin and thicker toward the base, buff. Odor mild when fresh, somewhat smelly when dried, or with the beef jerky flavor.

Hyphal structure:— Hyphal system monomitic, hyphae thick-walled, with clamp connections, colorless, 1.5–3.5 µm in diameter, IKI–, CB–; tissues unchanged in KOH.

Hymenium:— Cystidia fusiform, 34.5–39 × 3.5–4.5 µm; basidia narrowly clavate, with 2 sterigmata and a basal clamp connection, 28–35 × 3.5–5.5 µm.

Spores:— Basidiospores subglobose, with large droplet of oil, colorless, thin-walled, smooth, IKI–, CB–, 4.5–6.5 × 4–5.5 µm, L = 5.56 µm, W = 4.90 µm, Q = 1.09–1.17 (n = 60/2).

Additional specimens examined (paratypes):— China, Yunnan Province, Puer, Laiyanghe National Forestry Park , E 101°6′, N 22°35′, elev. 1207 m, on the dead bamboo, 30 Sep 2017, CLZhao 3277 ( SWFC), CLZhao 3171 ( SWFC) .

Figures

FIGURE 5. Basidiomata of Stereopsis yunnanensis (holotype). Bars: A = 1 cm, B = 1 mm.

FIGURE 6. Microscopic structures of Stereopsis yunnanensis (holotype). A Basidiospores. B Basidia and basidioles. C Cystidia. D A section of hymenium. Bars: A = 5 µm, B–D = 10 µm.