Nail galls on leaf uppersurface

Descrição:

Longitude (deg): -1.0. Latitude (deg): 51.4. Longitude (deg/min): 1° 0' W. Latitude (deg/min): 51° 30' N. Vice county name: Berks. Vice county no.: 22. Country: England. Associated species: Acer campestre. Identified by: Malcolm Storey. Comment: on leaves of field maple. Category: macro-photograph. Real world width(mm): 15.70566666667. Photographic equipment used: Specimens directly scanned on Black Widow 9630 SP flatbed scanner.