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
Royal Oak Foundation Royal Oak Foundation The Royal Oak Foundation is an alliance of American citizens supporting the mission of the National Trust of England, Wales and Northern Ireland, which is Britain's largest heritage organisation. The foundation is headquartered in New York City. Founded in 1973 the Royal Oak Foundation is a United States tax-exempt non-profit 501(c) (3) organisation. The foundation supports the preservation and conservation of places of natural beauty, historic properties and monuments and houses and gardens in Britain. In the United States, the foundation sponsors the Drue Heinz Lecture Series, which delivers lectures to the public in major U.S. cities