Habitat/range: On live and dead conifers, causing a white mottled rot in live roots and tree butts. In BC, on Abies lasiocarpa, Picea glauca, and P. sitchensis from Haida Gwaii, the Prince George area, Revelstoke, and Manning Park. Widely distributed in western North America.Basidiomata annual, soft and watery, developing in autumn; pileus fan- shaped or sessile, often imbricate, up to 15 cm wide × 15 cm long × 4 cm thick; pileus surface white to pale cream, flat to slightly convex, tomentose to hirsute; context white to cream, occasionally tan, up to 2 cm thick, duplex with a dense layer adjacent to the tubes; tubes up to 1.5 cm deep; pore surface white to cream; pores angular or irregular, 1–2 per millimetre, edges thin.
Hyphal system monomitic. Generative hyphae up to 8 μm diameter, com- monly branched, walls thin to thick; cystidia numerous, fusoid, up to 50 × 12 μm, embedded or projecting slightly, walls distinctly thickened over the apical half, many with a few granules on the surface near the apex; basidia clavate, 15–25 × 4–5 μm, four sterigmate; basidiospores ellipsoid to broadly ellipsoid, 4.5–6.5 × 3.0–4.5 μm, walls hyaline, thin, smooth, neither amyloid nor dextrinoid.