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This is particularly interesting to me. If you pick the galls when the larvae are fully grown, place the galls on some damp sand in a container. You might be lucky and the adults will emerge (?when).

I will name any adult males if you send them to me.

There are no recorded Chirosia species bred from Dryopteris, but perhaps this name is a synonym of another genus? C. betuleti has been bred from Athyrium

If you send me your email address by private message I will send you a PDF on a paper I wrote on Chirosia griseifrons and Athyrium