The wingspan is 34โ40 mm (1.3โ1.6 in). The moth is olive green, with broader forewings. Its crosslines and bands are usually more evenly and extensively whitish. The ground colour of the forewings is olive green or grey green. There is a paler central band and a pale basal area. The crosslines and chevron bands form an intricate pattern. The submarginal line is white. The hindwings are pale grey with a dark discal spot.[1] The larva is naked, long and thin, bright yellow-green with red-purple lateral stripes.
Similar species: Adults are similar in appearance to the red-green carpet (Chloroclysta siterata) but C. siterata has a reddish tinge and darker hindwings.
Adults are on wing from August to November and again (after overwintering as an adult) from April to May.
^Prout, L. B. (1912โ16). Geometridae. In A. Seitz (ed.) The Macrolepidoptera of the World. The Palaearctic Geometridae, 4. 479 pp. Alfred Kernen, Stuttgart.pdf