Common in birch woodland and heathland throughout Britain, most numerous in south-eastern England. Widespread and fairly common in Hampshire, but scarce on the Isle of Wight, with only one record so far this century. Wingspan 30-35 mm. Small size precludes confusion with all but Dotted Carpet Alcis jubata
, which is whiter, with more conspicuous black marking, and Brussels Lace Cleorodes lichenaria
, which has bolder, more strongly dentate subterminal fascia. Larva feeds on Downy and Silver Birch, and Alder, over-wintering as a pupa.