Crassisporus leucoporus B.K. Cui & Xing Ji

Ji, Xing, Wu, Dong-Mei, Liu, Shun, Si, Jing & Cui, Bao-Kai, 2019, Crassisporus gen. nov. (Polyporaceae, Basidiomycota) evidenced by morphological characters and phylogenetic analyses with descriptions of four new species, MycoKeys 57, pp. 61-84 : 61

Crassisporus leucoporus B.K. Cui & Xing Ji sp. nov. Figs 5 , 6

Notes.

Crassisporus leucoporus is characterized by a white pore surface when fresh, round to angular pores (3-4 per mm) and oblong ellipsoid basidiospores (8.4-11.2 × 4.2-5.4 μm).

Holotype.

AUSTRALIA. Queensland, Cairns, Roadside of Mount Whitfield Park, on fallen angiosperm branch, 18 May 2018, Cui 16801 (BJFC).

Etymology.

Leucoporus (Lat.): referring to the white pore surface when fresh.

Description.

Fruitbody: Basidiocarps annual, effused-reflexed to pileate, corky, without odor or taste when fresh, soft leathery to corky upon drying. Pilei semicircular or elongated, projecting up to 1.5 cm, 3 cm wide, and 6 mm thick at base. Pileal surface yellowish brown to umber-brown, finely velutinate, concentrically sulcate. Pore surface white when fresh, becoming cream, clay buff to pale yellowish brown when dry; sterile margin distinct, cream to pale yellowish brown, up to 1.5 mm wide; pores round to angular, 3-4 per mm; dissepiments slightly thick, entire. Context pale yellowish brown to fulvous, leathery, up to 3 mm thick. Tubes pale yellowish brown, corky, up to 2.5 mm long.

Hyphal structure: Hyphal system trimitic; generative hyphae bearing clamp connections; skeletal and binding hyphae IKI-, CB-; tissues turning to black in KOH.

Context: Generative hyphae infrequent, hyaline, thin-walled, unbranched, 1.1-2.6 μm in diam.; skeletal hyphae in context dominant, pale yellowish brown, thick-walled with a narrow to wide lumen, unbranched, straight, interwoven, occasionally simple-septate, 1.8-3.9 μm in diam.; binding hyphae hyaline to pale yellowish brown, thick-walled with a narrow lumen to subsolid, flexuous, frequently branched, interwoven, 0.7-2.2 μm in diam.

Tubes: Generative hyphae infrequent, hyaline, thin-walled, occasionally branched, 1-2.8 μm in diam.; skeletal hyphae dominant, hyaline to pale yellowish brown, thick-walled with a narrow to wide lumen, occasionally branched, more or less straight, strongly interwoven, 0.9-3.3 μm in diam.; binding hyphae hyaline to pale yellowish brown, thick-walled with a narrow lumen to subsolid, flexuous, frequently branched, interwoven, 0.8-2.1 μm in diam. Cystidia absent, cystidioles fusoid, sometimes septate at the tips, hyaline, thin-walled, 16.7-28.1 × 5.1-6.3 μm. Basidia clavate, bearing four sterigmata and a basal clamp connection, 18.1-29.2 × 6.4-9.8 μm; basidioles dominant, in shape similar to basidia, but smaller.

Spores: Basidiospores oblong ellipsoid, hyaline, smooth, slightly thick-walled, IKI-, CB-, (7.9 –)8.4–11.2(– 11.5) × (4 –)4.2–5.4(– 5.7) μm, L = 9.49 μm, W = 4.79 μm, Q = 1.99 (n = 60/1).

Type of rot.

White rot.

Figures

Figure 5. Basidiocarps of Crassisporus leucoporus. Scale bars: 1 cm (A); 2 cm (B).

Figure 6. Microscopic structures of Crassisporus leucoporus (drawn from the holotype) A basidiospores B basidia and basidioles C cystidioles D hyphae from trama E hyphae from context.