Solvin Zankl / Gall wasp (Cynips quercusfolii) emerging from the oak gall. Germany, October.

Colin Varndell / Cherry gall of the Gall wasp (Cynips quercusfolii) on the underside of Pedunculate oak leaf (Quercus robur). Dorset, UK, September.

Colin Varndell / Common spangle galls of Cynipid wasp (Neuroterus quercusbaccarum) on the underside of Pedunculate oak leaf (Quercus robur). Dorset, UK September.

Nick Upton / Cherry galls caused by Gall wasp (Cynips quercusfolii) on leaves of Pedunculate / English oak (Quercus robur), GWT Lower Woods reserve, Gloucestershire, UK, September.

Solvin Zankl / Gall wasp (Cynips quercusfolii) emerging from gall in oak. Germany. October.

Solvin Zankl / Female Gall wasp (Cynips quercusfolii) emerging from the oak gall, Germany. October.

Solvin Zankl / Knopper gall (Andricus quercuscalicis) on oak tree acorn, and Common spangle gall (Neuroterus quercusbaccarum) on oak tree leaf. Bavaria, Germany

Solvin Zankl / Common spangle gall (Neuroterus quercusbaccarum) on oak tree leaf. Niedersechsische Elbtalaue Biosphere Reserve, Elbe Valley, Lower Saxony, Germany, August.

Georgette Douwma / Silk button spangle galls caused by the gall wasp (Neuroterus numisalis) and Common spangle galls caused by another Gall wasp (Neuroterus quercusbaccarumon) on the underside of an English oak leaf (Qu...

Georgette Douwma / Silk button spangle galls caused by the Gall wasp (Neuroterus numisalis) and Common spangle galls caused by another gall wasp (Neuroterus quercusbaccarumon) on the underside of an English oak leaf (Qu...

Georgette Douwma / Close up of Common spangle galls caused by the gall wasp (Neuroterus quercusbaccarum) on the underside of an English oak (Quercus robur) leaf. UK.

Georgette Douwma / Silk button spangle galls caused by the gall wasp Neuroterus numisalis and Common spangle galls caused by the gall wasp Neuroterus quercusbaccarumon on the underside of an English oak leaf (Quercus ro...