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Another considerable gain of knowledge. Small ichneumonids are, in fact, braconids, and they parasitize only animals, not plants. And I thought I had possibly detected the source of the funny Tanacetum galls! (The pic, however, was taken at a very distant locality from the pics above, in Brandenburg.) I have often seen larvae in the bottom of the floral heads of thistles etc., but they never caused conspicuous deformations. In the case shown, however, the primordia of single flowers grew into bizarre, sterile galls. Is anybody among us who knows the originator, braconids being innocent?
Cordially, Sundew