Oudemansiella mucida, commonly known as porcelain fungus, is a basidiomycete fungus of the Physalacriaceae family and native to Europe.

O. mucida is a white, slimy wood-rot fungus and is strongly tied to rotting beech, where it grows in clusters. It is in season late summer to late autumn, and tiny fungi can then sometimes be seen parachuting from high branches, when they are dislodged by the wind on breezy days.