More or less flat, semicirular, margin acute, often pallid, grey-brown, unber or cocoa-coloured. hard and corky glabrous, upper surface knobbly, concentrically grooved, covered with a hard wrinkled crust. flesh cinnamon-brown , thinner that the tube layer, Tubes 7-25mm long in each annual layer, brown. Pores circular white brusing brown. Spores ovate-elliptical, truncate at one end. brown-ormamented. Tastes bitter , smells mushroomy.
