硬皮灵芝

Description: Basidiomata annual, sessile, soft corky when fresh. Pilei solitary, flatly flabelliform, up to 8 cm diam and 3 mm thick. Pileal surface ochraceous to yellowish brown when fresh, dull, glabrous, with obvious dark concentric zones and radial wrinkles; margin obtuse, entire, incurved when dry. Pore surface wood brown when dry; pores circular, 3–5 per mm; dissepiments moderately thick, entire. Context cream to pale wood brown, with dark melanoid lines, watery when fresh and turning hard corky when dry, up to 1.5 mm thick. Tubes straw yellow, up to 1.2 mm long. Hyphal system trimitic; generative hyphae with clamp connections, all the hyphae IKI + (dextrinoid), CB +; tissues darkening in KOH. Generative hyphae in context colourless, thin-walled, 2–3 μm diam; skeletal hyphae in context pale yellow, thick-walled with narrow lumen or sub-solid, arboriform and flexuous, 2–5 μm diam; binding hyphae in context colourless, thick-walled, rarely branched and flexuous, 1–1.5 μm diam. Generative hyphae in tubes colourless, thin-walled, 2–3 μm diam; skeletal hyphae in tubes pale yellow, thick-walled with narrow lumen or sub-solid, arboriform and flexuous, 2–4 μm diam; binding hyphae in tubes colourless, thick-walled, rarely branched and flexuous, up to 1.5 μm diam. Pileipellis composed of clamped generative hyphae, thin- to slightly thick-walled, apical cells clavate, flexuous, yellowish brown, about 25–43 × 3–7 μm, forming a patchy palisade. Cystidia and cystidioles absent. Basidia barrel-shaped, colourless, thin-walled, 25–35 × 22–24 μm; basidioles in shape like the basidia, colourless, thin-walled, 20–27 × 12–20 μm. Basidiospores ellipsoid to ovoid, truncated, pale yellow, IKI + (dextrinoid), CB +, double-walled with distinctly thick walls, exospore wall verrucose to vermicular, endospore wall with conspicuous spinules, (19.4–)19.8–21.5(–22) × (12.5–) 12.7–15(–15.2) μm, L = 20.48 μm, W = 13.96 μm, Q = 1.47 (n = 60/1, with the turgid vesicular appendix included).
Notes: The holotype of Trachydermella tsunodae was collected from Japan, and is distinguished by its pale white and watery context when fresh, large basidia (25–35 × 22–24 μm) and basidioles (20–27 × 12–20 μm), and truncated basidiospores with verrucose to vermicular exospore walls. The specimens of Tr. tsunodae used in this study were collected from Guizhou Province in southwest China. Our observations of Tr. tsunodae are generally consistent with the original description, but the obvious binding hyphae observed in this specimen are contrary to the dimitic hyphal system recorded by Imazeki (1952).