Fomitiporella vietnamensis Y.C. Dai, X.H. Ji & J. Vlasak

Ji, Xiao-Hong, Vlasak, Josef, Tian, Xue-Mei & Dai, Yu-Cheng, 2018, Three new species of Fomitiporella (Hymenochaetales, Basidiomycota) based on the evidence from morphology and DNA sequence data, MycoKeys 30, pp. 73-89 : 79-81

Fomitiporella vietnamensis Y.C. Dai, X.H. Ji & J. Vlasak sp. nov. Figs 7, 8

Holotype.

VIETNAM. Lam Dong Province, Lac Duong District, Bidoup Nui Ba National Park, 15 Oct 2017, on angiosperm tree, Dai 18377 (BJFC).

Etymology.

Vietnamensis (Lat.): referring to the distribution of the species in Vietnam.

Basidiomata perennial, effused-reflexed, imbricate, hard corky and without odor or taste when fresh, projecting up to 1 cm long, 4 cm wide and 5.5 mm thick. Pileal surface bearing curry-yellow and black zones when fresh, becoming deep olive when dry; pore surface bluish gray to ash-gray when fresh, becomes dark brick, shiny and uncracked on drying; margin yellowish-brown, less than 1 mm wide, thinning out; pores angular to circular, 4-7 per mm; dissepiments thin, slightly lacerate. Tubes rust-brown, paler contrasting with pores, up to 5 mm long. Subiculum dull brown, hard corky, up to 0.5 mm.

Hyphal structure.

Hyphal system dimitic; generative hyphae simple septate; skeletal hyphae dominant; tissue darkening but otherwise unchanged in KOH.

Subiculum.

Generative hyphae rare, hyaline to pale yellowish, thick-walled, rarely branched and septate, 2-2.5 µm in diam; skeletal hyphae dominant, golden yellow, thick-walled with a wide lumen, unbranched, aseptate, more or less flexuous, interwoven, 2-3.5 µm in diam.

Tubes.

Generative hyphae frequent, hyaline to pale yellowish, thin- to fairly thick-walled, occasionally branched, frequently septate, 2-2.7 µm in diam; skeletal hyphae dominant, golden yellow, thick-walled, unbranched, aseptate, straight, more or less parallel along the tubes, 2-3 µm in diam; setae absent; cystidioles ventricose with elongated apical portion, 7-14 × 3-5 µm; basidia barrel-shaped, with four sterigmata and a simple basal septum, 10-16 × 5-6 μm; basidioles similar to basidia in shape, but slightly smaller.

Spores.

Basidiospores broadly ellipsoid, yellowish-brown, thick-walled, IKI–, CB+, 4 –4.8(– 5) × (3 –)3.2–3.7(– 4) μm, L = 4.41 μm, W = 3.52 μm, Q = 1.23-1.28 (n = 60/2).

Additional specimen examined (paratype).

VIETNAM. Lam Dong Province, Lac Duong District, Bidoup Nui Ba National Park, 15 Oct 2017, on angiosperm tree, Dai 18382 (BJFC).