Oak apple due to the superficial resemblance and the preponderance of the oak marble gall in the wild. Other galls found on oak trees include the oak artichoke gall and the acorn cup gall, but each of these has its own distinctive form. Some common oak-apple-forming species are the "Biorhiza pallida" gall wasp in Europe, "Amphibolips confluenta" in eastern North America, and "Atrusca bella" in western North America. Oak apples may be brownish, yellowish, greenish, pinkish, or reddish. Oak galls have been used in the production of ink since at least the time of the Roman Empire. From the Middle Ages to
Apple Day varieties. Apple Day was initiated by Common Ground on 21 October 1990 at an event in Covent Garden, London, and has been celebrated in each subsequent year. By 2000 the day was celebrated in more than 600 events around the United Kingdom. Common Ground describe the day as a way of celebrating and demonstrating that variety and richness matter to a locality and that it is possible to effect change in your place. Common Ground has used the apple as a symbol of the physical, cultural and genetic diversity we should not let slip away. In linking particular apples with