Description Fruit bodies are annual, bent or outstretched-bent, fan-shaped, less often rosette-shaped, adherent to the substrate with the entire lateral side, rather small (2-3 centimeters in diameter), thin, rather rigid. They often grow in large groups, in long rows or tiled.
The upper surface is hairy, yellow, yellowish-brown or greenish, with concentric stripes, darker at the base. Greenish tint is given to it by green epiphytic algae. The edge is wavy, sharp, bright yellow. The underside is smooth, in young specimens the color of egg yolk, with age it becomes yellow-orange or yellow-brown, if damaged it darkens slightly, but does not turn red. From frost fades to grayish-brownish shades.
Ecology and distribution Grows on dead wood – stumps, windbreaks and individual branches – birch and other hardwoods, causing white rot. Occasionally infects weakened living trees. Quite widespread in the northern temperate zone. The growth period is from summer to autumn, in mild climates throughout the year.
Edible The mushroom is inedible.
Similar species Stereum subtomentosum is larger; a velvety (but not hairy) upper surface, colored in more reddish-brown shades; dull brownish lower surface and adhesion to the substrate only part of the lateral side (sometimes very small).