One of the mysteries of the English language finally explained.
A hard spherical gall which forms on the common oak in response to the developing larva of a gall wasp.
- ‘The marble gall, a green or brown growth about 2.5 cm (1 inch) in diameter, is caused by Andricus kollari.’
- ‘The oak marble gall is frequently confused with the oak apple gall, caused by another gall wasp, Biorhiza pallida.’
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