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Raised circular growths known as silk button spangled galls on the underside of a leaf of the Pedunculate or Common Oak (Quercus robur). They are caused by the lava of the gall wasp Neuroterus numismalis. Bedgebury Forest, Kent, UK. September 2003. Neuroterus numismalis # Under a leaf of the same long-suffering Quercus robur as the Knopper Galls are these two types of spangle galls: # The flat Common Spangle Galls of N. quercusbaccarum. up to 5mm diameter # The cupped Silk Button Spangle Galls of N. numismalis. about 2mm diameter # Again these are an asexual generation: the sexual generation of N. quercusbaccarum form currant galls on young leaves and catkins in spring, in this case still on Q. robur; those of of N. numismalis are inconspicuous leaf galls. # Cambridge TL464614, 2 Sep 2
. They are caused by the lava of the gall wasp Neuroterus numismalis. Bedgebury Forest, Kent, UK. September 2003.
Neuroterus numismalis
# Under a leaf of the same long-suffering Quercus robur as the Knopper Galls are these two types of spangle galls:
# The flat Common Spangle Galls of N. quercusbaccarum. up to 5mm diameter
# The cupped Silk Button Spangle Galls of N. numismalis. about 2mm diameter
# Again these are an asexual generation: the sexual generation of N. quercusbaccarum form currant galls on young leaves and catkins in spring, in this case still on Q. robur; those of of N. numismalis are inconspicuous leaf galls.
# Cambridge TL464614, 2 Sep 2){kind=link}