Ganoderma oregonense Murr. Fruit body annual; no stem or very small lateral stem-like attachment. Bracket up to 100cm across, 40cm wide, 20cm thick, semicircular or fan-shaped; upper surface yellowy brown to dark reddish brown or mahogany, with concentric bands of color; quickly develops a shiny, waxy crust that cracks extensively on older specimens. Tubes up to 3cm deep; pale purplish brown. Pores 2-3 per mm, circular to angular; surface cream-colored bruising brown or purplish brown. Flesh up to 15cm thick, soft fibrous; cream-colored to pale buff. Spores ellipsoid, blunt at one end, with a thick double wall, 13-17 x 8-10µ. Deposit rusty brown. Hyphal structure trimitic; clamps present. Habitat singly or occasionally overlapping on dead conifers or conifer stumps. Found in the Pacific Northwest. Season all year. Not edible. Comment Gilbertson has remarked that Ganoderma oregonense may be found to be a large form of Ganoderma tsugae (above) when further work is carried out.