The upperside forewings are marked in light and dark shades of brown and resemble the colouring of bark.

In addition to variations in the density of the forewing pattern intensity, differences in colour are also found on the hindwing.

It is very common in the autumn, feeding on apple trees in gardens, and on willow bushes in hedges.

The Moth is found about Midsummer.The larva (caterpillar) is pale bluish or yellowish green with small white-tipped tubercules and a grey-blue tail horn.

[5] The pupa is glossy reddish brown, and is formed below the soil surface in late summer, where it overwinters.