More or less flat, semi-circular, margin acute, often pallid, grey-brown, umber 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 bruising brown. Spores ovate-elliptical, truncate at one end. brown-ornamented. Tastes bitter , smells mushroomy.
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Found on the trunks of deciduous trees, especially beech, occasionally on pine.