Technical description and variation
The wingspan is 39–44 mm. Forewing pale grey, dusted with olive grey; lines strongly dentate, but much obscured, marked by short oblique costal streaks; upper stigmata ill-defined, but united at their base by a long black line; the reniform with fulvous in lower half; claviform elongate, black-edged, united by a short black streak with outer line; a well-marked black streak from base on submedian fold; submarginal line indicated only by black dentate marks preceding it, of which the two on the folds are longest; fringe mottled dark and light grey; hindwing pale brownish grey, darker towards termen; ab. ''sabinae'' Geyer is rather smaller, blue-grey, more distinctly marked, especially the median shade and submarginal teeth; reniform stigma with hardly any fulvous in it; the two black lines on submedian fold hardly visible.Biology
The moth flies from September to mid-November. The larva is dark green, dorsal and subdorsal lines white, segmentally swollen and partially interrupted; spiracular line yellowish white. The larvae feed on variousNotes
#''The flight season refers to Belgium and The Netherlands. This may vary in other parts of the range.''References
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