English: The fungus Fomes fomentarius has a fruiting body from 5 to 45 centimeters, 3 and 25 cm wide and 2 and 25 cm thick with the wide part attached to the tree on which the fungus grows. Although usually shaped like a horse's hoof, the species usually has broad, concentric ridges, with a blunt and rounded margin. The flesh is tough and fibrous, and cinnamon brown in color. The upper surface is firm, prickly, hard and woody, varying in color, usually light brown or gray. The margin is whitish during periods of growth. The hard rind is 1 to 2 mm thick and covers the tough flesh. Underside has circular cream-colored pores when new, maturing to brown, darkening to touch. The pores are circular, and there are 2-3 per millimeter. The tubes are 2 to 7 mm long and have a rust brown color.