Annual, resupinate or effused-reflexed, easily separable from the substrate; initially oval or rounded, later coalescing into basidiomes of various sizes and shapes, sometimes quite large in area (can reach a meter or more in length). The margin of the resupinate part of the basidiome is well-defined and sterile. Pilei measuring 0.5–2.5 × 1–7 × 0.2–0.6 cm, ranging in shape from small narrow reflexed lobes to nearly fan-shaped, with wavy margins, laterally fused or imbricately arranged. The pilear surface is concentrically furrowed, softly pubescent and slightly velvety in young specimens, ranging from nut-brown to umber, often white at the margin; with age it becomes glabrous, coarsely roughened, dark brown, sooty-brown, or almost black, and in old age covered with a thin hard crust.
The hymenophore surface in young specimens is whitish, creamy, or light beige, browns when pressed, and covered with a delicate whitish bloom that is easily damaged by touch; later it becomes brownish-gray, sometimes grayish-umber. The tubes vary in length and, in different parts of the hymenophore, can range from 0.5 to 5 mm long, with smooth margins, straight or slanted and then open, especially on vertical substrates. Pores rather thick-walled, unequal, rounded or angular, often elongated or labyrinthine, locally becoming daedaleoid, on average 1–2 per 1 mm.
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