Wingspan 14–17 mm. Forewings unicolourous greenish without any pattern. Head with black hairs in the male, bronze greyish in the female. In the male, the basis of the proboscis has a tuft of black hairs which are almost as long as the head.

White skin through which the inner organs can be seen; head capsule golden brown; thoracic plates light brown, darker at the sides.

Oval case, constructed from 3–6 pairwise, identical, crescent-like pieces of leaves, 9–12 mm.

Oviposition takes place in or on the stem of lower plants. The young larva lives in a flat bivalved case and feeds on dead leaves of the food plant.
Hibernation as a full-grown larva. Pupation inside the case during early spring. Sometimes, some larvae grow much slower and the larval stage can last for two years. In such cases, the species hibernates in the pupal stage.
Male moths are active in the sunshine, and swarm around the tops of trees and bushes, while females stay in the undergrowth. The female flies in a steep flight into the swarm and copulation takes place in the air after which the couple descends towards the lower vegetation.

The eggs are oviposited in lower plants like Impatiens. The young larva lives on the detritus of mainly Quercus and Fagus.

Bright deciduous forests with mainly Quercus robur and Fagus sylvatica, preferably in dry and warm areas.