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Diplolepis rosae
It's a gall of gall wasp. The gall wasp has szize of about 3mm. The opprtunity to find a male gall wasp of this typ is at about 1%. The legend says if you put the gall under your pillow you will sleep better, that's where the name "bedeguar gall" comes from.
Mostly on Field Rose (Rosa arvensis) or Dog rose (Rosa canina) shrubs.
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