Phylloporia oropheae Y.Y Shao, H.F. Zheng & F.C. Huang, 2025

Shao, Yuanyuan, Zheng, Haifu, Huang, Haisi, Wei, Qiulu, Huang, Fuchang & Liu, Bin, 2025, Two new species of Phylloporia (Hymenochaetaceae, Basidiomycota) from the karst region in southern China, Phytotaxa 693 (3), pp. 221-234 : 228-229

Phylloporia oropheae Y.Y Shao, H.F. Zheng & F.C. Huang , sp. nov. Figs. 4–5

MycoBank: MB847070

Diagnosis: — This species is distinct from the morphologically close species P. beninensis by the thick solitary woody hard basidiomata with an acute margin, consistently woody hard pilei with a brown base and pale-yellow margin, slightly refractive pores with 3–4 per mm, and ellipsoid to oblong-ellipsoid basidiospores measuring 4.2–5.3 × 2.6–3.6 μm.

Etymology: — oropheae (Latin) , referring to the host plant genus Orophea .

Holotype: — China, Guangxi, Jiangzhou District, Guangxi Chongzuo White-Headed Langur National Nature Reserve , 121°34′ E, 22°01′ N, elevation ca. 250 m, on branch of living Orophea hainanensis , 11 September 2021, HFZheng (GXU4511).

Fruiting body: —Basidiomata annual, pileate, sessile, woody hard, with minimal radial shrinkage when dry, typically solitary, rarely 2 or 3 growing confluently. Pilei consistently woody hard, with discolored coarse hairs, projecting up to 2.6 cm, 3.4 cm wide, and 1.1 cm thick at the base when dry, tomentose absent, margin dentate, acute and involute slightly, brown (7E5–8) to reddish brown (8E5–8) at the base, usually becoming paler outwards, pale-yellow to yellowish white at the margin (4A3, 4A2) ( Fig. 4a ). Pore surface rough, olive yellow (2B6) to pale yellow (4A3) ( Fig. 4d ). Pores polygon, 3–4 per mm, dissepiments thin, lacerated, refractive slightly. Black line thin at the pileus margin, and thick at the pileus base, reaching up to 6 mm.

Hyphal structure: — Hyphal system dimitic, tissue non-discoloring in 5% KOH solution, unchanged in Melzer’s reagent.

Context: — The pileipellis and the context are not distinctly differentiated. Context up to 5 mm thick, duplex with black line. Upper context brown (6E6–8), up to 3 mm thick. Generative hyphae colorless, frequently branched, 4.5–7.1 μm diam, skeletal hyphae light brownish (7D4–6), branched occasionally, simple septate, 5.4–9.3 μm diam, with 0.6–1.0 μm-thick walls; The lower context yellowish brown (5D5), generative hyphae colorless, thin walled, frequently branched, curve, 2.2–5.0 μm diam; skeletal hyphae pale brownish (5D4–5), frequently much branched, gradually taper, 5.0–9.0 μm diam, with 0.6–1.2 μm-thick walls. The black line layer: generative hyphae colorless to pale brownish (5D4–5), curved, frequently branched, 4.0–7.2 μm diam, thin-walled; skeletal hyphae pale brownish, faintly straight, occasionally branched, 4.7–7.8 μm diam, with 0.8–1.3 μm thick walled.

Tubes:—Tubes yellow (2A6) to yellowish brown (5D5), woody hard, up to 3 mm. Generative hyphae colorless to light brownish (7D4–6), thin-walled, branched frequently, simple septate, 2.5–4.8 μm diam; skeletal hyphae light brownish (7D4–6) to yellowish brown (5D5), thick-walled with a narrow lumen, branched occasionally, simple septate, 3.3–6.3 μm diam, with 0.8–1.8 μm-thick walls. Cystidia and cystidioles are absent. Basidia clavate, have four sterigmata, 10.9–21.4 × 6.0–6.9 μm. Basidioles in shape similar to basidia, but slightly smaller, 8.5–18.2 × 5.0–8.2 μm.

Spores:—Basidiospores ellipsoid to oblong or elongate, yellowish, thick-walled, smooth, IKI–, CB–, (4.1–) 4.2– 5.3(–5.7) × (2.5–)2.6–3.8(–3.9) μm, L= 4.85 μm, W= 3.12μm, Q = 1.26–1.96 (n = 60/2).

Additional material examined: — CHINA, Guangxi, Jiangzhou District, Taiping Street, 107° 23′5″E, 22° 32′22″N, elev. Ca. 281 m, 11 September 2021, HFZheng (GXU3728, GXU3736).

Ecology and distribution: — Grows alone or in groups on the plant of Orophea in the karst region. This species has been found only in Guangxi province, China.

Figures

FIGURE 4. Basidiocarps of Phylloporia oropheae. a, b, c: Basidiomata on dead wood stump; d: Pore surface of hymenophore. Scale bars = 1 cm.

FIGURE 5. Microscopic structures of Phylloporia oropheae. a: Basidiospores; b: Basidia; c: Basidioles; d: Generative hyphae from context; e, f: Skeletal hyphae from context; g: Skeletal hyphae from black line layer; h: Skeletal hyphae from tubes. Scale Bars=10 μm.