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Cynips quercusfolii gall (8)
dryas Silver Note Writer [C: 2 W: 0 N: 110] (1307)
Known phenomenon on oak leaves, the gall wasp (Ichneumonidae) lays eggs on the leaves of the oak, it responds by making gall.
Fertilized egg = female
Unfertilized egg = male
This is called arrhentokie
Gall wasp species in the genus Cynips.

Another pic in my workshop.

Eikenblad gal van de Galwesp.
Thanks for viewing and commenting.
gr.Yves

Altered Image #2

dryas Silver Note Writer [C: 2 W: 0 N: 110] (1307)
Leaf
Edited by:dryas Silver Note Writer [C: 2 W: 0 N: 110] (1307)

Oak leaf with gall on the ground.

gr.Yves

Altered Image #1

dryas Silver Note Writer [C: 2 W: 0 N: 110] (1307)
C.quercusfolii
Edited by:dryas Silver Note Writer [C: 2 W: 0 N: 110] (1307)

Other form and color.

gr.Yves