Tripe fungus or Hairy curtain crust

The fruiting body is a flattened, side-attached bracket, 3–7 cm (sometimes up to 10) across. The upper surface is gray-brown to dull grayish, with distinct concentric zones and a hairy/bristly coat, often with a film of green algae. The edges are wavy, rounded in young ones and often cracked in mature ones.

Fruiting body 1-4 cm across, thin, leathery, spatula-shaped to fan-shaped, attached by the side or back. Upper surface densely covered with short (up to 0.3 cm) stiff hairs — like felt. Color distinctly zoned — banded: alternating yellow-orange, ocher, rusty-brown and gray-brown concentric zones. Older areas turn gray-brown. The margin in young specimens is bright yellow-orange, sharp.

The lower (concave) surface is strongly folded and convoluted, reddish-brown or violet-brown, gelatinous. The folds radiate out from the point of attachment. The spore print is white.

Smooth, with no pores, gills or spines — typical of the genus Stereum ("stereum" from Greek stereo — "hard, smooth"). Color of the underside yellow-ocher when young, brownish gray with age. Spore print white.

There is no stem, or it is very short and lateral. The fruiting body is attached by its side to the substrate with a broad base. Several bodies often merge into a shared colony.

No stem. The fruiting body is attached to the substrate by its side or back edge (sessile).

The flesh of young mushrooms is gelatinous and springy; when it dries it becomes hard and leathery, and when soaked it regains its shape (like the jelly ear). Old fruiting bodies harden and darken irreversibly.

Flesh very thin, leathery, tough, brownish yellow. Useless in the kitchen — like cardboard. Smell faint, neutral.

The smell is faint and neutral. The taste is bland — the mushroom soaks up the flavor of the seasonings.

Faint, neutral, with no notable features.