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 major span of the Woodward Dream Cruise. The city sponsors ancillary events around the Cruise. It is the site of the Detroit Zoo, one of the region's leading tourist attractions. In December 2009 it was announced that the Arts, Beats and Eats festival would be moved from Pontiac to Royal Oak. In addition to "The Detroit News" and "Detroit Free Press", regional newspapers serving all of southeast Michigan, the city is served by the "Daily Tribune", "The Oakland Press", the "Royal Oak Review", and "The Mirror". Royal Oak, Michigan Royal Oak is a city in Oakland County in the U.S.