Thallus in the form of large leaf-shaped plates, grayish-brown or brown in the dry state and green in the moistened state, leathery, spread over the substrate or hanging down, cut along the edge into short lobes. The surface of the thallus is covered with a network of folds, along the tops of which chains of spot-like growths or isidia are placed. The folds delimit the pits, which on the lower plane correspond to almost bare, dull, light tubercles. The underside of the thallus is vesicular-uneven, covered with thick brown felt (excluding tubercles). Apothecia are infrequent, sessile or short-stalked, with a red-brown disc and a thin thallus margin. Spores are colorless, bicellular (not often multicellular), ellipsoid.
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Grows on trunks and branches of coniferous and hardwoods, distributed everywhere.
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Contains mucus, tannins, lichen acid, bitter stictic acid.
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In folk medicine, a decoction or tincture of vodka is drunk for pulmonary tuberculosis.