Wingspan 18-22 mm.
A fairly variable species, though usually showing a pale blotch on the dorsal area, sometimes edged with darker.
Distributed throughout mainland Britain, although generally commoner in the north, especially Scotland.
The moths fly in July and August, from dusk onwards, when it can be attracted to light.
The larva rolls a leaf of birch (Betula), hazel (Corylus) or sallow (Salix) and feeds inside.