The wingspan is 10–11 millimetres (0.39–0.43 in). Adults are on wing from April to September. The larvae feed on Circaea × intermedia, Circaea lutetiana, Chamerion angustifolium, Epilobium collinum, Epilobium hirsutum, Epilobium montanum and Epilobium parviflorum. They mine the leaves of their host plant. The mine starts as a full depth corridor. The frass is black and deposited in an irregular central line. Later, the mine has the form of a blotch with frass in irregular clouds. The blotch may be a continuation of the corridor, but may be found on a different leaf. There are often several mines in a single leaf. The mines are white at first but turn brown later. Pupation takes place outside of the mine.
- Mompha langiella on UKMoths
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