Bjerkandera adusta

Common Name: None.
Description: Bracket 2-4 cm across, 1-2 cm wide, 1-6 mm thick, overlapping, undulate; upper surface gray-brown with a white margin when young, becoming darker and blackening at the margin with age; suedelike, leathery, drying hard.. The flesh is a pale buff with a thin layer of matted hair up to 6 mm thick.
Habitat: on dead logs and slash of deciduous and coniferous wood; often several fused together in tiers or in an overlapping group which may be 20 cm across. Common. Found throughout North America.
Edible: Not Edible.

Source: Mushrooms of North America by Roger Phillips.