The forewings are usually pale grey, distinctively marked with a row of three angular black marks. The ground colour, however, is quite variable with pinkish or reddish forms occurring fairly frequently. In the north of Scotland, including Orkney and Shetland, an almost black form occurs (some authorities regard this as a subspecies, E. g. edda). The hindwings of the typical forms are white, grey in the darker forms. The wingspan is 32–38 mm. This species flies from the latter half of August to the first half of September  and is attracted to light and heather flowers.
Eugnorisma glareosum is a species with an Atlantic-Mediterranean distribution, which occurs from Morocco and the Iberian peninsula, through Western and Central Europe to the British Isles, southern Norway, southern Sweden, Poland and Estonia. It has expanded East in the last century.
Technical description and variation
Forewing pearly grey, with fine dark dusting; cell before and beyond orbicular stigma velvety black brown; subbasal and inner lines marked each by a black spot on costa and another below median vein; outer and submarginal lines pale; hindwing whitish, dusted with grey, especially in female - the form edda Stgr. occurring in the Shetland Islands is dark, with forewing red-brown and the hindwing dark brown; — rosea Tutt is lilac grey suffused with rosy; - limbata Gouin, from the Gironde in France, has the forewing tinged with bluish green, and the marginal area darker than usual.
Larva pale brown, darker along the sides; the dorsal and subdorsal lines pale, dark-edged; spiracular line ochreous yellow. The larva feeds on a range of plants: It has been recorded on bedstraws, docks, hawkweeds, heather, lettuce, plantains and willows as well as grasses such as Poa. This species overwinters as a very small larva.
- Funet Taxonomy
- Seitz, A. Ed., 1914 Die Großschmetterlinge der Erde, Verlag Alfred Kernen, Stuttgart Band 3: Abt. 1, Die Großschmetterlinge des palaearktischen Faunengebietes, Die palaearktischen eulenartigen Nachtfalter, 1914
- "Robinson, G. S., P. R. Ackery, I. J. Kitching, G. W. Beccaloni & L. M. Hernández, 2010. HOSTS - A Database of the World's Lepidopteran Hostplants. Natural History Museum, London.".
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- 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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