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    beech twig

    Knopper gall Andricus quercuscalicis on English Pendunculate or Common Oak Quercus robur

    Knopper gall Andricus quercuscalicis on English Pendunculate or Common Oak Quercus robur.   Illustrations shows  mature gall, formed from acorn embryonic tissue thanks to the gall wasp

    Lizzie Harper