One of the mysteries of the English language finally explained.
A spongy spherical gall which forms on oak trees in response to the developing larvae of a gall wasp.
The wasp is Biorhiza pallida (in Europe) or Amphibolips confluenta (in America), family Cynipidae
- ‘Oak apple galls are sometimes mistaken for an actual crop of the tree, such as apples on on apple tree, but are actually deformed leaves.’
- ‘An oak apple is also known as an oak gall.’
- ‘The so-called oak apple, a round, spongy, fruitlike object about 2.5 to 5 cm (1 to 2 inches) in diameter, is caused by the larvae of the gall wasp Biorhiza pallida.’
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