Phellinus vietnamensis B.K. Cui, 2018

Zhu, Lin, Ji, Xing, Si, Jing & Cui, Bao-Kai, 2018, Morphological characters and phylogenetic analysis reveal a new species of Phellinus with hooked hymenial setae from Vietnam, Phytotaxa 356 (1), pp. 91-99 : 94-95

Phellinus vietnamensis B.K. Cui , sp. nov. ( Figs. 2, 3 )

MycoBank no.: MB 824101

Diagnosis.— The new species is characterized by perennial and pileate basidiomata, circular and small pores (7–9 per mm), presence of hooked hymenial setae, and ovoid to broadly ellipsoid, colorless, fairly thick-walled, weakly dextrinoid and moderately cyanophilous basidiospores.

Type.— Vietnam. Lam Dong Province, Da Lat City, Bidoup Nuiba National Park, on angiosperm stump, 15 October 2017, Cui 16434 (Holotype, BJFC! isotype in IFP!).

Etymology.— Vietnamensis (Lat.): refers to the type specimen collected from Vietnam.

Fruitbody. —Basidiomata perennial, pileate, usually solitary, woody hard, without odor or taste when fresh; consistently woody hard and light in weight upon drying. Pileus usually ungulate, projecting up to 5 cm, 7 cm wide and 5.5 cm thick at base. Pileal surface yellowish buff, cinnamon-buff, cinnamon brown to dark brown when fresh, becoming cinnamon to fawn brown upon drying, concentrically sulcate with indistinct wide zones, smooth; margin distinct, yellowish brown to cinnamon brown, obtuse. Pore surface pale yellowish brown to fuscous when fresh, becoming cinnamon-brown to dark brown upon drying; distinctly glancing; pores round, 7–9 per mm; dissepiments thin to slightly thick, entire. Context yellowish brown, hard corky to woody hard, up to 5 cm thick. Tubes concolorous with pore surface, woody hard, up to 5 mm long.

Hyphal structure.— Hyphal system dimitic; generative hyphae simple-septate; skeletal hyphae IKI–, weakly CB+; tissues darkening but otherwise unchanged in KOH.

Context.— Generative hyphae colorless to pale yellowish, fairly thick-walled, branched, 2–4 μm in diam; skeletal hyphae dominant, yellowing brown to pale reddish brown, thick-walled with a wide to narrow lumen, occasionally branched, loosely interwoven, 3–4.5 μm in diam.

Tubes.— Generative hyphae colorless to pale yellowish, fairly thick-walled, branched, 1.4–3 μm in diam; skeletal hyphae dominant, yellowish brown to pale reddish-brown, thick-walled with a wide to narrow lumen, occasionally branched, more or less subparallel along the tubes, 2–5 μm in diam. Hymenial setae abundant, ventricose, usually hooked, dark brown, thick-walled, 20–35 × 8–15 μm. Cystidia and cystidioles absent. Basidia barrel-shaped, with four sterigmata and a simple septum at the base, 9–15 × 5–8 μm, basidioles in shape similar to basidia, smaller than basidia. Irregular crystals frequently present in trama.

Spores.— Basidiospores ovoid to broadly ellipsoid, colorless, fairly thick-walled, smooth, weakly dextrinoid, moderately CB+, (5–)5.5–6(–6.5) × (4.5–)5–5.5 μm, L = 5.87 μm, W = 5.11 μm, Q = 1.15 (n = 30/1).

Figures

FIGURE 3. Microscopic structures of Phellinus vietnamensis (drawn from the holotype). a. Basidiospores; b. Basidia and basidioles; c. Hymenial setae; d. Hyphae from trama; e. Hyphae from context. Bars: a–e = 10 μm.