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Knopper Galls on the fruit, acorn, of the Pedunculate or Common Oak (Quercus robur). These are caused by the lava of the gall wasp Andricus quercuscalicis. Bedgebury Forest, Kent, UK. 19 August 2005
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. These are caused by the lava of the gall wasp Andricus quercuscalicis. Bedgebury Forest, Kent, UK. 19 August 2005){kind=link}