Cyanosporus linzhiensis Y. C. Dai, Chao G. Wang, Yuan Yuan & Ghobad-Nejhad, 2024

Wang, Chao-Ge, Liu, Shun, Ghobad-Nejhad, Masoomeh, Liu, Hong-Gao, Dai, Yu-Cheng & Yuan, Yuan, 2024, Three new species of Cyanosporus (Polyporales, Basidiomycota) from China, MycoKeys 107, pp. 249-272 : 249-272

Cyanosporus linzhiensis Y. C. Dai, Chao G. Wang, Yuan Yuan & Ghobad-Nejhad sp. nov.

Figs 2 , 3

Holotype.

China. • Xizang Autonomous Region: Nyingchi , Zayü County, 27 Oct. 2023, on fallen branch of Pinus yunnanensis , Dai 27023 ( BJFC 044575 , GenBank: ITS PP 479782 , LSU PP 479804 , mtSSU PP 510197 , nrSSU PP 488289 , RPB 1 PP 526259 , RPB 2 PP 526268 ).

Etymology.

In reference to the species being found in Linzhi (Nyingchi) of Xizang Autonomous Region, southwest China.

Diagnosis.

Cyanosporus linzhiensis is characterized by their pileate basidiomata with a bluish tint and azonate pileal surface when fresh and dry, white to pale bluish gray pore surface when fresh, pores angular to irregular, 5–6 per mm, cystidioles fusoid and basidiospores allantoid, 4–5 × 1.2–1.5 µm.

Basidiomata annual, pileate, soft and without odor or taste when fresh, becoming soft corky to fragile upon drying; pileus flabelliform, up to 3 cm, 3.5 cm wide and 8 mm thick at the base. Pileal surface white, somewhat with a bluish tint when fresh, becoming white to pinkish buff when dry, velutinate, azonate. Hymenophore white to pale bluish gray when fresh, becoming pinkish buff to honey yellow and with a blue tint upon drying; sterile margin almost absent; pores angular to irregular, 5–6 per mm, with thin dissepiments becoming lacerate. Context white, soft corky, up to 5 mm thick. Tubes concolorous with pore surface, soft corky to fragile when dry, up to 3 mm long. Context and tubes turn dark olive green in KOH.

Hyphal system monomitic; hyphae clamped, hyaline, slightly thick-walled, with a wide lumen, smooth; in the context frequently branched, more or less flexuous, loosely interwoven, 3–5 µm in diam; in the tubes unbranched, straight, subparallel along the tubes, agglutinated, 2–3.5 µm in diam.

Cystidia absent, but cystidioles fusoid are present, thin-walled, 12–13.5 × 3 µm.

Basidia clavate, 9–13 × 4–5 µm, with basal clamp and four sterigmata.

Basidiospores allantoid, 4–5 × 1.2–1.5 µm, L = 4.5 µm, W = 1.4 µm, Q = 3.1–3.5 (n = 60 / 2), thin-walled, smooth, hyaline, IKI -, CB -.

Type of rot.

Brown rot.

Additional specimen examined.

China. • Xizang Autonomous Region: Nyingchi , Bomê County, 27 Oct. 2023, on fallen angiosperm trunk, Dai 27141 ( BJFC 044575 , GenBank: ITS PP 479781 , LSU PP 479803 , mtSSU PP 510196 , nrSSU PP 488288 , RPB 1 PP 526258 , RPB 2 PP 526267 ) .

Figures

Figure 2. Basidiomata of Cyanosporus linzhiensis (Dai 27023, holotype). Scale bar: 1 cm.

Figure 3. Cyanosporus linzhiensis (Dai 27023, holotype, ) A basidiospores B basidia and basidioles C cystidioles D hyphae from context E hyphae from trama. Scale bars: 5 µm (A); 10 µm (B-E).