Sidera tianshanensis B.K. Cui & T.M. Xu, 2023

Xu, Tai-Min, Sun, Yi-Fei, Liu, Shun, Song, Chang-Ge, Gao, Neng, Wu, Dong-Mei & Cui, Bao-Kai, 2023, Ceriporiopsis tianshanensis (Polyporales, Agaricomycetes) and Sidera tianshanensis (Hymenochaetales, Agaricomycetes), two new species of wood-inhabiting fungi from Xinjiang, Northwest China, MycoKeys 98, pp. 1-18 : 1

Sidera tianshanensis B.K. Cui & T.M. Xu sp. nov.

Figs 5 , 6

Diagnosis.

Sidera tianshanensis is characterized by annual to perennial basidiocarps, measuring 15 mm thick, pores measuring 5-7 per mm, cream to rosy buff pore surface, allantoid basidiospores measuring 3-3.5 × 1-1.4 µm, and growing on the stump or trunk of Picea schrenkiana .

Type.

China. Xinjiang Autonomous Region, Tekes County, Kosang Cave National Forest Park , on fallen trunk of Picea schrenkiana , 19 September 2021, Cui 19143 (holotype) .

Etymology.

Picea tianshanensis (Lat.): referring to the species occurrence in Tianshan.

Fruiting body.

Basidiocarps annual to perennial, resupinate, soft corky, up to 10 cm long, 5 cm wide, and 15 mm thick at the center; pore surface cream to buff yellow, uncracked; sterile margin indistinct, cottony, white, thinning out; pores angular, 5-7 per mm; dissepiments thin, entire; subiculum white, cottony and up to 0.1 mm thick; tubes concolorous with pore surface, up to 15 mm long.

Hyphal structure.

Hyphal system dimitic; generative hyphae bearing clamp connections; rosette-like crystals frequently present; all hyphae IKI-, CB-; tissue unchanged in KOH.

Subiculum.

Generative hyphae infrequent, thin-walled, hyaline, occasionally branched, 2-2.5 µm in diameter; skeletal hyphae dominant, interwoven, unbranched, 2-3 µm diameter.

Tubes.

Generative hyphae infrequent, thin-walled, hyaline, occasionally branched, 1.5-2.5 µm in diameter; skeletal hyphae dominant, thick-walled with a wide to medium lumen, hyaline, occasionally branched, interwoven, flexuous, 2-3 µm in diameter. Cystidia absent; cystidioles present, fusoid, thin-walled, hyaline, basally swollen, with hyphoid neck and sharp tip, 15-22 × 3-4 µm. Basidia barrel-shaped, hyaline, bearing four sterigmata and a basal clamp connection, 5.5-7 × 3.5-4.5 µm; basidioles pyriform, shorter than the basidia.

Spores.

Basidiospores allantoid, hyaline, thin-walled, smooth, occasionally with one or more guttules, IKI-, CB-, 3-3.5 × 1-1.4 µm, L = 3.12 µm, W = 1.18 µm, Q = 2.6-2.7 (n = 150/5).

Type of rot.

White rot.

Additional specimens (paratypes) examined.

China. Xinjiang Autonomous Region, Tekes County, Kosang Cave National Forest Park, on stump of Picea schrenkiana , 19 September 2021, Cui 19132; Tekes County, Karada Town, Qiongkushitai Village, on stump of Picea schrenkiana , 19 September 2021, Cui 19186, Cui 19192; on fallen trunk of Picea schrenkiana , 19 September 2021, Cui 19196, Cui 19251.

Figures

Figure 5. Basidiocarp of Sidera tianshanensis (Cui 19143). Scale bar: 2.0 cm.

Figure 6. Microscopic structures of Sidera tianshanensis (Cui 19143) a basidiospores b basidia and basidioles c Cystidioles d hyphae from the subiculum e hyphae at the disappearance edge f hyphae from trama.