([Denis & Schiffermüller], 1775)[Synonyms: Olethreutes olivana]
Wingspan c. 15 mm.
A widespread but locally distributed species over much of the British Isles, though generally more frequent further north.
The adults fly during July and August, frequenting damp and marshy habitats. The normal flight period is after dark, but the males especially can sometimes be flushed from grass in the daytime.
The early stages are not well documented in the British Isles, though on the continent the larvae are known to feed on mosses and herbaceous plants.