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Description type:Non-original description 
Description:Fruitbody. — Basidiocarps perennial, usually effused-reflexed to pileate, occasionally resupinate, often imbricate, hard corky and without odour or taste when fresh, woody hard and light-weight when dry, resupinate part up to 10 cm long and 4 cm wide. Pilei projecting up to 3 cm, 7 cm wide, and 8 mm thick at base. Pileal surface dark grey to black, obscurely concentrically sulcate with narrow zones, velutinate, becoming glabrous with age, eventually forming a crust; margin acute. Pore surface isabelline to umber-brown, more or less glancing; margin narrow to almost lacking, golden yellow, paler than pores; pores circular, 5–7 per mm; dissepiments thick, entire. Context fuscous, darker than tubes, woody hard, thin, not exceeding 0.5 mm. Tubes brownish grey, woody hard, tube layers distinct, up to 7 mm thick; white mycelial strands present in old tubes.
Hyphal structure. — Hyphal system dimitic; generative hyphae simple septate; tissue darkening but otherwise unchanged in KOH.
Context. — Generative hyphae hyaline, thin-walled, frequently branched and simple septate, 1.5–2.5 µm in diam; skeletal hyphae dominant, rust-brown, thick-walled with a narrow lumen, unbranched, flexuous, 2.2–3.8 µm in diam.
Tubes. — Generative hyphae hyaline, thin-walled, occasionally branched, frequently simple septate, 1.5–2.5 µm in diam; skeletal hyphae dominant, yellowish brown, thick-walled with a narrow lumen, unbranched, flexuous, interwoven, 2–3.5 µm in diam. Setae infrequent, subulate, rust-brown, thick-walled, 24–35 — 4–8 µm; basidia clavate, with four sterigmata and a simple septum at the base, 8–11 — 5–6.5 µm; basidioles in shape similar to basidia, but slightly smaller.
Spores. — Basidiospores broadly ellipsoid, hyaline, becoming pale yellowish with age, fairly thick-walled, smooth, IKI–, CB– or slightly CB+, (4.9–)5–6(–6.2) — (3.9–)4.1–5(–5.1) µm, L = 5.41 µm, W = 4.48 µm, Q = 1.17–1.22 (n=90/3).
 
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