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A pale green ball, 1 cm in diameter, hard on touch. Attached under the leaf and provokes a pale green discoloration on the other side (Photo 4). Some brown powder, probably excrements, inside the gall. Seems to cause the whole leaf to decay, while still on the stem.
Lowland deciduous (protected) forest, on the banks of river Rhone.
Spotted on Jun 20, 2015
Submitted on Jun 20, 2015