The wingspan is 30–35 millimetres (1.2–1.4 in).[2] Its forewings are ochreous dusted very densely with yellow brown; a slight dark cell mark; inner and outer lines brownish, more or less parallel, the inner curved in cell, the outer more widely beyond it; subterminal line oblique; hindwing with costal area pale, without markings; a faint outer line; subterminal dark, externally edged with pale.[4]
Figs. 6 larva after hibernation on birch catkins 6a enlargement of two segments
Biology
The moth flies from late May until early July.
Larvae are dull reddish ochreous, with dorsal, subdorsal, and lateral rows of dark freckled diamond-shaped marks; head fuscous. The larvae feed on dead, decaying leaves of oak, alder and birch.[5]
^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.
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