Irpex lacteus

Common Name: None
Description: Fruit body annual; no stem; resupinate and overlapping or laterally fused, with the edges curling up from the elongated, spreading, crustlike mass; up to 7 cm across, 1 cm wide, 0.5 cm thick; upper surface white, cream, or pale buff; densely woolly or hairy.
Habitat: on logs, stumps, branches, or trunks of dead hardwoods and occasionally on dead conifers. Common. Found widely distributed throughout North America except the Southwest.
Edible: No.

Source: Mushrooms of North America by Roger Phillips.