gall on a oak leaf

baeume broad broadleafed broadleaved buchenartig buchenartige cherry cynips decidous deciduous deutsche eichengallwespen europa gall gallen galls gallwespe gallwespen gemeine hautfluegler insect insects juetland juettland jylland leaf leaved midtjylland oaks pedunculate plant quercusfolii scandinavia skandinavien tree trees vejers wesp wespe wesps