Appearance
The species is quite variable in appearance, the forewings occurring in various shades of grey or brown, with melanic forms common in parts of its range. The best identifying feature is the large, pale, squarish stigma which gives the species its common name. The hindwings are pale to dark grey with a whitish fringe. The wingspan is 30–40 mm.
Behavior
This moth flies at night from July to September and is attracted to light, making it susceptible to light traps, and sugar. It also visits flowers such as heather, marram grass and ragwort. It is found in woodland edges, waste ground and suburban habitats with a distribution that covers most of England.Larva greenish ochreous, with pale dorsal and subdorsal lines edged with dark; between them a row of oblique marks. The larva feeds on a variety of plants such as bedstraw, oak and willow, as well as various grasses. The species overwinters as a larva, remaining active and feeding throughout.
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