Knopper Gall on acorn, Crowsheath Community Woodland, Downham
Uploader's Comments
The Knopper Gall (on left acorn) is caused by a tiny gall wasp, Andricus quercuscalicis. It produces ridged outgrowths on the acorns of our native Pedunculate Oak see http://www.wildlifetrusts.org/species/knopper-gall
Uploaded to Geograph by Roger Jones on 21 September 2013
