This is quite a small species with a wingspan of 22–30 mm. The forewings are white with dark grey cryptic markings, giving excellent camouflage against the lichens on which the eggs are laid. The intensity of the markings vary considerably, with darker individuals predominating in urban areas, an example of industrial melanism. A significant proportion of individuals also have orange or yellow markings. The hindwings are whitish with a broad grey band at the margin. The adults fly at night in July and August  and are attracted to light.
- Chinery, Michael Collins Guide to the Insects of Britain and Western Europe 1986 (Reprinted 1991)
- Skinner, Bernard Colour Identification Guide to Moths of the British Isles 1984
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