Sarcomyxa serotina is a species of fungus in the family Sarcomyxaceae.

Its recommended English name in the UK is olive oysterling.

[2] Fruit bodies grow as greenish, overlapping fan- or oyster-shaped caps on the wood of both coniferous and deciduous trees.

The gills on the underside are closely spaced, bright orange yellow, and have an adnate attachment to the stipe.

[3] The species is considered to be either edible or inedible, with the taste ranging from mild to bitter.