Habitat/range: On conifers and hardwoods, causing a brown rot. In BC, known on Pinus contorta in Kelowna, on P. monticola and Populus sp. in Quesnel, and reported on Pseudotsuga menziesii (Shaw 1973). Elsewhere in western North America, known from AK, WA, and MT.Basidiomata effuse to widely effuse, perennial, up to 2 cm thick, soft, separa- ble; taste bitter; margin white, smooth, narrow; context white, friable, thin, indistinct; tubes white to pale yellow, appearing resin-soaked, each layer up to 2 mm deep, young layers distinct, old layers friable; pore surface white to cream; pores round, 3–6 per millimetre.
Generative hyphae 2–5 μm diameter, skeletal hyphae sinuous, 3–5 μm diameter; cystidioles typically numerous, fusoid, up to 18 μm tall, walls hyaline to pale yellow; basidiospores broadly cylindrical to oblong ellipsoid, 4.5–7.0 × 2.5–3.5 μm.
Notes: Microscopic preparations of basidioma tissues often contain numer- ous oily globules. Antrodia sordida also has them, but its basidiospores are only 1.5–2.0 μm wide and skeletal hyphae have weakly amyloid walls.