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Thanks Sundew,

I was referring to this thread : https://diptera.info/forum/viewthread.php?forum_id=4&thread_id=55681

I looked for C. misella galls last year, but didn't find one. To be honest, I neither found the fly in 2018, in earlier years I saw them quite often.

If you compare it with Urophora cardui galls, which are very easy to find, it's a remarkable difference, although cardui-galls are bigger and the plant more transparant.

Both flies seem to be common in parts of Europe.

Ben