Wingspan c. 6.5-9 mm.
This tiny, retiring species has a somewhat scattered distribution, occurring locally in various counties across the British Isles, but is most probably overlooked elsewhere.
Its preferred habitat is damp woodland and similar habitats where the foodplant (wood-sedge, Carex sylvatica) grows, although it may also use other sedges. The larva creates a narrow gallery on the leaves in the autumn and then changes to a new leaf in spring after hibernation.
Adult moths fly in a single generation in June and July.