Habitat/range: On the ground in coniferous forests, especially under pines, presumably ectomycorrhizal. Scattered across BC from Revelstoke south to the BC/WA border with two northern collections from Hazelton and Smith- ers. Elsewhere in western North America, it is uncommon and known from WA, ID, MT, OR, and CA.
Basidiomata solitary, stipitate, relatively large; stipe central to lateral, 4–8 cm long, 1–3 cm thick, cylindrical, solid, firm, surface dull, matte; pileus 5–15 (–20) cm broad, round to irregular in outline, convex; pileus surface dull grey to blackish grey to brown with an olivaceous tint, glabrous, smooth to scaly; margin entire to undulating, down-curved, becoming plane; context 1–3 cm thick, firm, fleshy, white, darkening where bruised, drying black; tubes 2–8 mm deep; pore surface white, becoming pale grey, decurrent; pores 1–4 per millimetre, angular, edges thin.
Hyphal system monomitic. Generative hyphae 3–20 μm diameter with clamp connections, walls hyaline, thin to slightly thickened; basidia clavate, up to 43 × 10 μm, four long sterigmata; basidiospores subglobose, 5–7 μm diameter or oblong, 5–6 × 4–5 μm, irregular in outline, walls hyaline to pale brown, ornamented with prominent rounded warts, neither amyloid nor dextrinoid.
Notes: The fleshy, predominately grey, bolete-like basidiomata, and unusual basidiospores, characterize this species. Boletopsis smithii K.A. Harrison, from Washington but not yet found in British Columbia, is distinguished by its dull orange pileus surface.
Polypores of British Columbia (Fungi: Basidiomycota)