Silk button spangle galls, circular with a depression in the middle, thickly strewn on the underside of an oak leaf. Common spangle galls, also found on the underside of oak leaves, rise to a peak in the centre.
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Silk button spangle galls, circular with a depression in the middle, thickly strewn on the underside of an oak leaf. Common spangle galls, also found on the underside of oak leaves, rise to a peak in the centre.