Phellinus ferruginosus (Fr.) Pat. Fruit body 4-15cm across, 0.5-1.5cm thick, growing closely attached to the wood, spreading widely and irregularly with little swellings along the margin; cinnamon to rusty brown; leathery and flexible. Tubes 1-3mm deep in each layer, up to l0mm in total; tawny or umber-brown. Pores 5-6 per mm, round and entire on horizontal parts, split elsewhere; surface even, with little swellings or slightly wavy; tawny to umber-brown with yellowish-brown margin in growing specimens. No stem. Flesh irregular, thickness up to 5mm, loose, cottony; cinnamon to rusty brown. Spores broadly ellipsoid, nonamyloid, 4-5 x 3-3.5µ. Habitat on dead hardwoods. Found in northern North America. Season annual to perennial. Not edible.