Stereum sanguinolentum - Mushroom annual. Initially single, then in colonies. Spread out, adhered with the entire base to the ground, merging and covering a large area, spread-bent, semicircular, fan-shaped, sometimes tile-shaped; single fruiting bodies 5 to 30 mm in diameter, 2 to 5 mm thick.
Upper surface rough, shortly hairy, crumpled, pleated, concentrically zoned; yellowish, brownish to black-brown; the edge is wavy, serrated, bright at youth, then darkening, initially flawed.

Hymenium (genus layer) smooth, strongly wrinkled, crumbly. Yellow-gray, pink, gray-brown to brown, often with shades of purple; after rubbing (in about 60s) it turns bloody red and gives off blood-red liquid; after drying, cracked.

Flesh is very thin, hard, bony, even leathery, cork; reddish color, bleeding after injury.

Occurrence: Throughout the year, in coniferous and mixed forests, less often in deciduous trees, in parks, on living and dead trunks and branches of mostly coniferous trees, most commonly pine, spruce, fir and larch; common.

Value: Unaffected fungus.