Polyporus brumalis Fr. Fruit body annual. Cap 1.5-10cm across, circular, convex or depressed with an inrolled margin; yellow-brown to reddish brown or blackish brown; dry, densely hairy when young, becoming almost smooth. Tubes 1-3mm deep, slightly decurrent. Pores 2-3 per mm, circular to angular; whitish. Stem 20-60 x 1-5mm, central or off center; grayish or brownish; minutely hairy or smooth. Flesh 1-2mm thick; white. Spores cylindrical to sausage-shaped, smooth, 5-7 x 1.5-2.5µ. Deposit white. Habitat on dead hardwoods, especially birch. Common. Found in eastern North America, west to the Great Plains, and occasionally in the Pacific Northwest. Season June-October. Not edible.