Albatrellus alpinus H.M. Zhou & Y.C. Dai, 2021

Zhou, Hong-Min, Wu, Ying-Da & Dai, Yu-Cheng, 2021, A new species of Albatrellus sensu stricto (Albatrellaceae, Russuales) from China, Phytotaxa 510 (1), pp. 43-52 : 47-49

Albatrellus alpinus H.M. Zhou & Y.C. Dai , sp. nov. ( Figs. 2–3 )

MycoBank: 840110

Type:— CHINA. Yunnan Province, Lijiang, Yulong County, Laojunshan, Ninety-nine Longtan Scenic Area, on ground in forest of Pinus and Quercus , alt. 3800 m. 15 August 2018, B. K. Cui, Cui 17023 (Holotype, BJFC 030322).

Etymology:— Alpinus (Lat.): refers to the species being found in the alpine zone of the mountains.

Description:— Basidiocarps annual, terrestrial, centrally or laterally stipitate. Pilei circular to flabelliform or irregular-shaped, up to 2.5 cm diam, and 2 mm thick. Pileal surface buff to pale yellow when fresh, rough to faintly squamulose, clay buff to grayish brown upon drying, azonate. Pore surface hazel to sepia when dry; pores irregular, 2–3 per mm; dissepiments thin, entire to lacerate. Context white when fresh, becoming reddish brown to black upon drying, rigid, up to 1.6 mm thick. Tubes white when fresh, buff to curry yellow or cigar brown when dry, brittle, up to 0.4 mm long. Stipe clay buff to fawn when fresh, becoming dingy with age and gradually becoming reddish brown upon drying, up to 2.5 cm long, 5 mm diam.

Hyphal system monomitic; generative hyphae thin- to thick-walled, simple septate. Pileipellis composed of generative hyphae, hyaline, thin- to thick-walled, simple septate, IKI+, CB –, 3–10 μm diam; shapeless oily substance exuding from the hyphae, becoming gray-black in KOH and yellow-brown to red in Melzer’s reagent. Context composed of generative hyphae, hyaline, thin- to thick-walled, simple septate, occasionally branched, interwoven, IKI–, CB –, 3–20 μm diam; gloeoplerous hyphae thin-walled, 3–10 μm diam, shapeless oily substance exuding from the hyphae but rarely. Stipitipellis composed of generative hyphae thin- to thick-walled, IKI+, CB –, 2.5–10 μm diam, shapeless oily substance exuding from the hyphae. Trama of tubes composed of generative hyphae hyaline, thin-walled, simple septate, parallel along the tubes, IKI–, CB –, 2.5–3.5 μm diam; cystidia and cystidioles absent; basidia clavate with two or four sterigmata and a simple septum at the base, 19–24.5 × 5–6 μm.

Basidiospores ovoid to ellipsoid, hyaline, thin- to slightly thick-walled, smooth, mostly with a guttule, IKI+, CB –, (3.5–)3.9–5 × (2.9–)3–4 μm, L = 4.21 μm, W = 3.31 μm, Q = 1.23–1.34 (n = 90/3).

Additional specimens examined (paratypes):— CHINA. Yunnan Province, Dali , Heqing County, on ground in forest of Pinus , 31 August 2019, Y. C . Dai, Dai 20813 ( BJFC 032480 ); Jianchuan County, Laojunshan Nature Reserve , on ground in mixed forest, alt. 3000 m. 22 July 2019, Y. C . Dai, Dai 20905 ( BJFC 032564 ) .

Figures

FIGURE 2. A basidiocarp of Albatrellus alpinus (Holotype, Cui 17023). Scale bar = 1.0 cm. Photo by: B.K. Cui.

FIGURE 3. Microscopic structures of Albatrellus alpinus (Holotype). a Basidiospores b Basidia and basidioles c Stipitipellis hyphae d Pileipellis hyphae e Hyphae from context f Hyphae from trama. Drawings by: H.M. Zhou.