Collected by: Irene Mounce and Jean Straight
Collectors number: Overholts 22021
Collection date: 31/08/1938
Location details: Saanichton
Country (state): British Columbia
Substrate details: on log of gymnospermous tree
Habitat/range: On conifers, causing a brown cubical rot, sometimes decaying power poles and mine timbers. Widespread south of 51°n in BC; elsewhere in western North America, known from WA, ID, and MT south to AZ and NM.Basidiomata infrequently perennial, widely effuse, tough, corky, adnate, up to 1.5 cm thick; taste weakly bitter; margin typically abrupt, white, becom- ing pale brown, narrow; context white, amyloid, thin, cottony to fibrous, up to 0.5 cm thick; tubes white, up to 1 cm deep; pore surface white to cream; pores round to angular, 3–5 per millimetre, edges thin to thick, entire.
All hyphae have amyloid walls; generative hyphae 3–4 μm diameter; skeletal hyphae 5–8 μm diameter; basidiospores cylindrical to narrowly ellipsoid, 5.0–6.5 × 2–3 μm.
Notes: Microscopically, the amyloid walls of all hyphae are distinctive. Some skeletal hyphae have frequent branches, and they could be interpreted as binding hyphae.