A plant pathogen, causing a white rot of various dead hardwoods (especially willows) and conifers. The cap is 5 to 15 cm wide; broadly convex to more or less flat. Fan-shaped or nearly round in outline; dry; smooth or minutely hairy; pale grayish to brown or reddish brown; typically with zones of color. Pore surface is white, becoming dingy brownish in age; typically with elongated, maze-like pores and fairly thin walls between the pores, but sometimes with more or less round pores, or even with the pores elongated so much that they appear like gills; often bruising salmon pink to reddish when handled. Stem is absent.
Found growing alone or on decaying hardwood logs and stumps, or rarely from the wounds of living hardwoods.