Basidiomes are annual, appearing as convex, sessile caps with a triangular cross-section, growing singly or fused together, semi-circular or kidney-shaped, up to 12 cm long and 8 cm wide, with a sharp, sometimes slightly wavy margin. Initially white or whitish, later turning yellowish or brownish, often with dark speckles. The surface is finely velvety at first, becoming bare with age, and in old specimens covered with a wrinkled cuticle. Fully resupinate (crust-like) forms occasionally occur.
Due to agglutination of hyphae, a smooth, film-like surface forms; as it dries, it develops irregular radial zoning. In older specimens, this surface becomes wrinkled and ranges from dirty yellowish to pale gray.
The spore-bearing layer is white, turning slightly yellow with age or upon drying, and shows almost no color change when damaged. Tubes are up to 8 mm long; pores range from round or angular to elongated or even labyrinthine, thin-walled, with 3–5 pores per mm.
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