Bjerkandera adusta - A one-year fungus, cap-like, without a stipe. Adnate sideways, tile-shaped, sometimes spread-bent and merging with others. A group of frequently laid roof tiles may cover the surface up to 500 mm in length.

A hat in the shape of a semi-circular, 20 to 70 mm long, 10 to 20 mm wide and 3 to 6 mm thick. Uneven, pleated, young suede, with age naked. Colors for fawn youth, gray-brown, later black-brown, black, with bright concentric zones. The shore is thin, sharp, bent, vain, young whitish, then blackening. Flawed edge of resupinate fruiting bodies 2 to 4 mm wide, whitish, at the touch of blackening. Hymenophore tubular, whitish, smoky gray, gray-brown; in older individuals it can be labyrinthine. After compressing, it turns black.

Single-layered tubes, short. Lengths 1 to 2 (2.5) mm, sometimes far to the ground. Colors of gray, light or smoke.

Pores are round, or slightly angular, in part extending vertically, elongated places, in old fruiting bodies sometimes slightly labyrinthaceous. Small, 4 to 6 by 1 mm. Diameters 0.15 to 0.25 (0.8) mm.

The pulp is 2 to 3 mm thick. The whitish color in the upper part, later gray or isabelate. In the lower part of the very thin one can see a thin dark gray narrow line merging with tubes, the colors of the tubes. The smell is quite strong fungus, slightly acidic flavor.

Occurrence: In deciduous and mixed forests, in parks, gardens; on dead and living deciduous trees, especially on beech, oak, rake, maple, birch; rarely on coniferous, spruce and Douglas fir. It grows up individually and in clusters; throughout the year. Very common.

Value: Unaffected fungus.