鹦哥岭空洞孢芝

Basidiomata annual, centrally stipitate, woody hard. Pileus single, suborbicular to umbelliform, up to 7 cm diam and 4 mm thick. Pileal surface yellowish brown to ferruginous when dry, dull, tomentose, with obvious concentric dark zones and radial wrinkles, slightly sagging at the centre; margin obtuse, entire, flat or incurved and wavy when dry, extending to pore surface. Pore surface white when fresh, colour unchanging when bruised, pale yellow when dry; pores subcircular to angular or irregular, 5–7 per mm; dissepiments slightly thick, entire. Context pale buff, without dark resinous lines, hard corky, up to 2 mm thick. Tubes straw colour, woody hard, up to 2 mm long. Stipe concolorous with pileal surface, cylindrical and hollow, up to 6 cm long and 6 mm diam. Hyphal system trimitic; generative hyphae with clamp connections, all hyphae IKI–, CB+; tissues darkening in KOH. Generative hyphae in context colourless, thin-walled, 2–3 μm diam; skeletal hyphae in context colourless to pale yellow, thick-walled with a wide to narrow lumen or subsolid, arboriform branched and flexuous, 3–5 μm diam; binding hyphae in context colourless, subsolid, branched and flexuous, up to 3 μm diam. Generative hyphae in tubes colourless, thin-walled, 2–3 μm diam; skeletal hyphae in tubes colourless to pale yellow, thick-walled with a wide to narrow lumen or subsolid, arboriform branched and flexuous, 2–4 μm diam; binding hyphae in tubes colourless, subsolid, branched and flexuous, 1–2 μm diam. Pileal cover composed of clamped generative hyphae, thin- to thick-walled, apical cells clavate, faintly slanting to one side and tortuous, bright yellow, about 50–80 × 5–12 μm, forming an irregular palisade. Cystidia or cystidioles absent. Basidia barrel-shaped to clavate, colourless, thin-walled, 16–21 × 11–13 μm; basidioles in shape similar to basidia, colourless, thin-walled, 11–15 × 5–11 μm. Basidiospores globose to subglobose, pale yellow, slightly dextrinoid, CB+, with double and distinctly thick walls, exospore wall smooth, endospore wall with conspicuous spinules, (7–)7.2–8.5(–8.7) × 6.6–8 μm, L = 7.89 μm, W = 7.17 μm, Q = 1.1 (n = 60/1). Under SEM, exospore wall uneven or foveolate, endospore wall with some hollow and columnar spinules which persist to exospore wall forming holes.