Laetiporus xinjiangensis J. Song, Y.C. Dai & B.K. Cui

Song, Jie, Sun, Yi-Fei, Ji, Xing, Dai, Yu-Cheng & Cui, Bao-Kai, 2018, Phylogeny and taxonomy of Laetiporus (Basidiomycota, Polyporales) with descriptions of two new species from western China, MycoKeys 37, pp. 57-71 : 59-62

Laetiporus xinjiangensis J. Song, Y.C. Dai & B.K. Cui Figures 2b, 4

Diagnosis.

Differs from other Laetiporus species by its pale-buff to clay-pink pileal surface, cream to light-yellow pore surface, large pores (2-3 per mm) and smaller basidiospores (4.5-5 × 3-4.2 μm).

Etymology.

Xinjiangensis (Lat.): referring to the locality (Xinjiang Autonomous Region) of the type specimens.

Holotype.

CHINA. Xinjiang Auto. Reg., Ili Kazak Autonomous Prefecture, Gongliu County, West Tianshan National Nature Reserve, on living tree of Betula , 14 Sep 2015, Dai 15953 (BJFC 020054).

Basidiocarps.

Annual, sessile to laterally substipitate, imbricate, odour distinctive, taste with acid flavor, fleshy when fresh, crumbly when dry. Pilei flabelliform to dimidiate, applanate, projecting up to 15 cm, 20 cm wide and 3 cm thick. Pileal surface pale-buff to clay-pink when fresh, becoming pale-buff to cream upon drying, glabrous, azonate to faintly zonate when fresh. Margin blunt, clay-buff to greyish- brown to brown when juvenile, fading to dark brown when dry. Pore surface cream to light yellow when fresh, becoming pale yellow when dry; sterile margin pale yellow when fresh, up to 2 mm wide; pores angular, 2-3 per mm; dissepiments thin, entire to lacerate. Context white when fresh, becoming cream to pale yellow when dry, up to 2.2 cm thick. Tubes concolorous with pore surface, crumbly or chalky, up to 8 mm long.

Hyphal structure.

Hyphal system dimitic; generative hyphae simple-septate; skeletal hyphae IKI–, CB–, dissolving in KOH. Generative hyphae in context infrequent, hyaline, thin-walled, occasionally branched, up to 11 µm in diam.; skeletal hyphae in context dominant, hyaline, thick-walled with a wide lumen, frequently branched and interwoven, occasionally simple-septate, 8-15 μm in diam. Generative hyphae in tubes dominant, hyaline, thin-walled, frequently branched, simple-septate, 4-6 µm in diam.; skeletal hyphae in tubes thick-walled with a wide lumen, occasionally branched and simple-septate, subparallel along the tubes or interwoven, 3-5 µm in diam.

Cystidia.

Cystidia and other sterile hyphal elements absent.

Basidia.

Basidia clavate, 20-25 × 6-8 μm, bearing four sterigmata and a basal simple-septum; basidioles clavate, smaller than basidia.

Spores. Basidiospores ellipsoid to ovoid, hyaline, thin-walled, smooth, IKI–, CB–, 4.5-5 × 3-4.2 μm, L = 4.87 μm, W = 3.65 μm, Q = 1.33-1.37 (n = 60/2).

Additional specimens

(paratypes) examined. CHINA. Xinjiang Auto. Reg., Shihezi, on living tree of Populus , 9 Sep 2015, Dai 15825 (BJFC 019930) & Dai 15828 (BJFC 019931); Burqin County, on living tree of Salix , 9 Sep 2015, Dai 15836 (BJFC 019937) & Dai 15838 (BJFC 019939); Burqin County, Kanas Integrated Nature Landscape Protect Region, on living tree of Salix , 11 Sep 2015, Dai 15893 (BJFC019994); Ili Kazak Autonomous Prefecture, on living tree of Populus , 13 Sep 2015, Dai 15902 (BJFC 020003) & Dai 15905 (BJFC 020006); 4 Oct 2015, Dai 15898A (BJFC 019999).