Aleurodiscus amorphus or Hairy curtain crust

There is no “cap” as such. The fruiting body is at first cup-shaped, 4–6 mm across, attached to the substrate. Several such cups merge into a shapeless film. The surface is leathery-hairy, orange-pink.

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.

Smooth type of spore-bearing surface (no gills or tubes). Reddish, paling as it dries. Spores large, 20–25 × 16–20 µm, egg-shaped, with a slightly spiny surface.

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. The fruiting body is attached to the substrate bark over its whole surface — the typical crust-fungus growth form.

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

flesh thin, leathery. No pronounced color changes when cut.

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

No distinctive smell. This is a mushroom that “doesn’t smell” — especially when dried.

Faint, neutral, with no notable features.