Antella tibetica P. Du & Y.C. Dai, 2022

Du, Ping, Cao, Tian-Xu & Dai, Yu-Cheng, 2022, A new species of Antella (Steccherinaceae, Agaricomycetes) from southwest China, Phytotaxa 543 (5), pp. 283-290 : 286-288

Antella tibetica P. Du & Y.C. Dai , sp. nov. ( Figs. 2–3 )

MycoBank no.—MB 843263

Diagnosis:— Antella tibetica is characterized by annual, resupinate basidiocarps with large pores, 0.5–1.5 per mm, a dimitic hyphal system with generative hyphae bearing clamp connections, and subicular skeletal hyphae bearing fine crystals, abundant gloeocystidia variable in shape, oblong-ellipsoid basidiospores, and growth on living or dead angiosperm wood. It can easily be distinguished from other members of the genus by the presence of cystidioles, variable gloeocystidia, strongly encrusted subicular hyphae, and growth on angiosperm wood.

Etymology:— tibetica (Lat.) : refers to Tibet, where the type was collected.

Type:— Chian, Tibet, Lingzhi , Selila Mts. , on dead branch of Prunus , elev. 3700 m, 23 October 2021, Dai 23334 (Holotype, BJFC 037905 ) .

Description:— Basidiocarps annual, resupinate, adnate, tough and coriaceous, without odor or taste when fresh, corky upon drying, up to 4 cm long, 2.5 cm wide, 5 mm thick at center. Pore surface buff yellow to buff when fresh, pinkish buff to yellowish brown upon drying; pores angular, round to irregular, mature pores distinctly larger than the juvenile ones, mature pores mostly 0.5–1.5 per mm; dissepiments thin to thick, entire to lacerate. Sterile margin distinct, white when fresh, up to 0.5 mm, almost lacking with age. Subiculum buff, very thin or almost lacking, ca. 0.2–0.3 mm thick. Tubes concolorous with pore surface, corky, up to 4.8 mm long.

Hyphal system dimitic; composed of generative hyphae with clamp connections, and skeletal hyphae, hyaline, IKI–, CB+; tissues unchanged in KOH. Subiculum composed of hyaline generative hyphae, thin- to slightly thickwalled, occasionally branched, 2–3 μm diam, and hyaline skeletal hyphae, thick-walled to subsolid, rarely branched, usually encrusted with fine crystals, slightly interwoven, 2.5–4 μm diam.

Tubes composed of hyaline generative hyphae, thin-walled, occasionally branched, 2–2.5 μm diam and hyaline skeletal hyphae, thick-walled to subsolid, unbranched, interwoven, 2–3.5 μm diam. Hyphal pegs absent. Gloeocystidia commonly present, with oily substance, refractive and yellowish in IKI, variable in shape, fusoid, clavate or pyriform, 32–45 × 8–12 μm. Cystidioles fusoid, 17–24 × 3–4 μm. Basidia clavate, bearing four sterigmata and a clamp connection at the base, 17–19 × 4–5.5 μm. Basidioles similar to basidia in shape, but slightly smaller. Basidiospores mostly oblongellipsoid, hyaline, thin-walled, smooth, some with one or two small guttules, IKI–, CB–, (3.1–)3.2–4 × (1.5–)1.6–2 μm, L= 3.59 μm, W = 1.81 μm, Q=1.95–2 (n=60/2).

Additional material studied (paratype):— China, Tibet, Milin County, Nanyigou Forest Park, on living tree of Hippophae , elev. 3000 m, 16 September 2014, Cui 12097 ( BJFC 017011 ) .

Figures

FIGURE 2. Basidiocarps of Antella tibetica (Holotype, Dai 23334). Scale bar = 1.0 cm. Photo by Yu-Cheng Dai.

FIGURE 3. Microscopic structures of Antella tibetica (Holotype, Dai 23334). a Basidiospores; b Basidia and basidioles; c Cystidioles; d Gloeocystidia; e Hyphae from subiculum; f Hyphae from trama. Drawing by Meng Zhou.