Phellinus igniarius - Perennial mushroom, attached laterally. In shape, initially tuberous, spherical, later laden, sometimes console-like or flattened, rarely spread. 100 to 400 mm long, 50 to 200 mm wide and 20 to 80 mm thick. The surface is mossy in youth, then bare, dull, concentrically furrowed and deeply cracked. Initially reddish or brown, grayish pubescent, later gray-gray, black-brown, blackish, to black. The edge is rounded, fluffy. In color similar to the surface of the hymenophore rust, cinnamon or tobacco, covered with a grayish coating during growth.

Multilayer tubes, 3 to 5 mm long in each layer. Reddish-brown, rusty-brown and chestnut-colored, with age growing with white hyphae.

Circular pores, very fine, 0.05 to 0.15 mm in diameter, 4 to 6 by 1 mm. Rust-cinnamon or chestnut-colored, often covered with a grayish coating when young.

Homogeneous pulp, may be slightly striate. Hard, woody. Thicknesses 5 to 20 mm. Reddish-brown, chestnut, sometimes black-brown at the top. Under the influence of KOH, it turns black. In older fruitbodies covered on the top with a poorly visible resinous skin. The smell is indistinct mushroom-like, sour-bitter taste.

Occurrence: In deciduous and mixed forests, in parks, along roads, above streams. It fruits on live deciduous trees and continues to grow for some time after the death of the host. Commonly found on willow, hornbeam, maple, beech, poplar, aspen, birch, also on oak, elm, alder, rowan. Very common. Throughout the year.

Value: Inedible mushroom.