50.4 MB (1.7 MB compressed)
3636 x 4847 pixels
30.7 x 41.1 cm ⏐ 12.1 x 16.2 in (300dpi)
ADRIAN BICKER / SCIENCE PHOTO LIBRARY ADRIAN BICKER / SCIENCE PHOTO LIBRARY
Knopper gall on acorn. Close-up of two acorns from an Pedunculate Oak (Quercus robur) tree. The lower one has been infected by the parasitic larva of a gall wasp (Andricus quercuscalicis), causing the formation of a knopper gall (growth, spiky, lower centre). The larva develops within a hard inner gall, which provides it with both food and protection. Parthenogenetic (all female) adults emerge from the galls during the following spring.
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