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, Michigan including Fort Detroit and environs. After the American Revolutionary War, Britain promoted development of what was then called Upper Canada and Province of Quebec, across the Detroit and St. Clair rivers to the south and east. Royal Oak was not incorporated as a village until 1891, and as a city in 1921. It was named in 1819, during one of the surveying expeditions led by Territorial Governor Lewis Cass. A large oak tree at this small settlement reminded Cass of the story of the Royal Oak, where King Charles II of England was said to hide to escape capture by