Phylloporia vietnamensis L.W. Zhou, H.W. Wei & S.L. Liu

Wei, Hao-Wen, Zhao, Jing, Wang, Yan, Liu, Shi-Liang, Wang, Xue-Wei & Zhou, Li-Wei, 2024, Phylloporia vietnamensis sp. nov. (Hymenochaetales, Basidiomycota) from Vietnam, Phytotaxa 640 (3), pp. 243-254 : 248-252

Phylloporia vietnamensis L.W. Zhou, H.W. Wei & S.L. Liu , sp. nov. ( Figs. 3 , 4 )

Fungal names number: FN 571847

Type: Vietnam, Dong Nai Province, Dinh Quan District, Thac Mai Preservation Park , on the ground under angiosperm forest, 14 October 2017, L.W. Zhou, LWZ 20171014-13 (holotype in HMAS) .

Etymology: vietnamensis (Lat.) , refers to the country “ Vietnam ” where the holotype was collected.

Diagnosis: Differing from other species of Phylloporia by annual, terrestrial, eccentrically stipitate basidiomes, small pores (9–11 per mm), a dimitic hyphal system in the upper tomentum, and the presence of cystidioles.

Description: Basidiomes annual, eccentrically stipitate, without odor or taste, becoming lighter and hard when dry. Pilei semi-circular to circular, up to 4.5 cm long, 2.5 cm wide, and 0.1–0.3 cm thick. Pileal surface honey-yellow to grayish brown when dry, concentrically sulcate. Pore surface honey-yellow to grayish brown when dry; pore 9–11 per mm; dissepiments thin, entire. Context thin, up to 1.3 mm thick, duplex, separated with a black line, the lower context cinnamon-buff, hard corky, up to 1 mm thick, the upper context as tomentum, clay-buff, up to 0.3 mm thick. Tubes honey-yellow, woody, up to 2 mm long. Stipe honey-yellow to grayish brown, cylindrical or more frequently flattened, up to 3 cm long and 1.5 cm in diam.

Hyphal system dimitic in upper tomentum, monomitic in lower context and trama; generative hyphae simple septate; tissue darkening but otherwise unchanged in KOH. In upper tomentum, generative hyphae colorless to buff-yellow, thick-walled, unbranched, 3.5–6 μm in diam; skeletal hyphae infrequent, golden yellow, thick-walled, unbranched, 4–6 μm in diam. In lower context, generative hyphae colorless to buff-yellow, thin to thick-walled, occasionally branched, 2.5–5 μm in diam. Tube generative hyphae colorless to coral, subparallel along the tubes, thin to thick-walled, occasionally branched, 2.5–4.5 μm in diam. Cystidioles rarely present, lageniform, colorless, thin-walled, 10–15 × 3–5 μm. Basidia clavate to subclavate, with four sterigmata, colorless, thin-walled, 8–12 × 3–5 μm; basidioles similar to basidia in shape, but slightly smaller. Basidiospores abundant, slightly thick walled, ellipsoid, yellowish, inamyloid, acyanophilous, 3–4 × (1.8–)2–2.4 µm, L = 3.45 µm, W = 2.1 µm, Q = 1.64 (n = 30/1).

Figures

FIGURE 3. Basidiomes of Phylloporia vietnamensis (LWZ 20171014-13). Scale bars: 2 cm.

FIGURE 4. Microscopic structures of Phylloporia vietnamensis (drawn from the holotype).A. Basidioles; B. Basidia; C. Cystidioles; D. Basidiospores; E. Hyphae from upper tomentum; F. Hyphae from lower context. G. A vertical section of the trama. Scale bars: A–C: 15 μm; D: 5 μm; E–G: 20 μm.