Polyporus miscanthi Q.Y. Zhang & Y.C. Dai

Zhang, Qiu-Yue, Liu, Hong-Gao, Zeng, Guang-Yu & Dai, Yu-Cheng, 2024, Polyporus miscanthi (Polyporaceae, Basidiomycota), a new polypore on Miscanthus (Poaceae) from Guangxi, South China, Phytotaxa 655 (3), pp. 249-260 : 255-257

Polyporus miscanthi Q.Y. Zhang & Y.C. Dai , sp. nov., Figs. 2 , 3

MycoBank No: 854044

Type:— CHINA. Guangxi Autonomous Region, Hezhou, Dazhongshan Forest Park, 111°32’32” E, 24°24’35” N, on rotten Miscanthus , 15 April 2023, Dai 24655 ( BJFC, holotype).

Etymology:— Miscanthi (Lat.), refers to the species inhabiting Miscanthus .

Description:— Basidiomata annual, eccentrically stipitate, solitary, leathery when fresh, soft corky when dry. Pilei irregularly circular, with a depressed center or infundibuliform, up to 2 cm in diam and 1 mm thick at center. Pileal surface yellowish when fresh, buff when dry, glabrous, slightly occasionally zonate and with radially aligned stripes; margin sharp, incurved upon drying. Pore surface white when fresh, cream when dry; pores mostly angular, sometimes sinuous, 4–5 per mm; dissepiments thick, entire. Context cream and soft corky when dry, up to 0.5 mm thick. Tubes paler than pore surface, soft corky when dry, decurrent, up to 0.5 mm long. Stipe mouse gray to hazel when fresh, black when dry, glabrous, up to 6 cm long and 2 mm in diam.

Hyphal structure:—Hyphal system dimitic; generative hyphae bearing clamp connections, hyaline, thin-walled; skeleto-binding hyphae thick-walled, with arboriform branches, IKI−, CB +; tissue unchanged in KOH.

Context:—Generative hyphae infrequent, hyaline, thin-walled, rarely branched, 3–4 μm in diam; skeleto-binding hyphae dominant, hyaline, thick-walled with a narrow lumen, frequently branched, strongly interwoven, 3–5 μm diam.

Tubes:—Generative hyphae infrequent, hyaline, thin-walled, rarely branched, 1.5–3 μm in diam; skeleto-binding hyphae dominant, hyaline, thick-walled with a narrow lumen, frequently branched, interwoven, 2–4 μm in diam. Cystidia and cystidioles absent. Basidia mostly pear-shaped, with four sterigmata and a basal clamp connection, 15–24 × 7–10.5 μm; basidioles in shape similar to basidia, but slightly smaller.

Stipe:—Generative hyphae infrequent, hyaline, thin-walled, rarely branched, 2–3 μm in diam; skeleto-binding hyphae dominant, hyaline, thick-walled with a narrow lumen, frequently branched, interwoven, 3–7 μm in diam.

Basidiospores:—Cylindrical, hyaline, thin-walled, smooth, sometimes with a guttule, IKI–, CB –, 9–11(–12) × 3.5–4.5(−4.8) μm, L = 10.07 μm, W = 3.95 μm, Q = 2.55–2.56 (n = 60/2).

Additional specimen examined:— CHINA. Guangxi Autonomous Region, Hezhou, Dazhongshan Forest Park, 111°32’32” E, 24°24’35” N, on rotten Miscanthus , 15 April 2023, Dai 24656 ( BJFC, paratype).

Figures

FIGURE 2. Basidiomata of Polyporus miscanthi (Holotype, Dai 24655). Photo by: Yu-Cheng Dai.

FIGURE 3. Microscopic structures of Polyporus miscanthi (Dai 24655). a Basidiospores. b Basidia and basidioles. c Hyphae from context. d Hyphae from trama. e. Hyphae from stipe. Drawings by: Qiu-Yue Zhang.