My today´s discovery. Not very rare, but interesting.
The rose bedeguar gall, Robin's pincushion gall, or moss gall[1][2] develops as a chemically induced distortion of an unopened leaf axillary or terminal buds, mostly on field rose (Rosa arvensis) or dog rose (Rosa canina) shrubs, caused by the parthenogenetic hymenopteran gall wasp (Diplolepis rosae (Linnaeus, 1758)), previous synonyms are D. bedeguaris, Rhodites rosae or Cynips rosae. Diplolepis females lay up to 60 eggs within each leaf bud using their ovipositors. The asexual wasp emerges in spring; less than 1% are males.
https://en.wikipedia.org/wiki/Diplolepis_rosae
Czech republic, South Bohemia, Trebon region.
Pentax K 50, f/11, 1/100 sec, 200 ISO