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, New Zealand combined tram shelter, gas lamp standard and drinking fountain. By the middle of the 20th century it was decided that the memorial was an obstruction to traffic and it was removed during September and October 1947. The Royal Oak roundabout served six converging roads but one has been closed off in recent years. Royal Oak became the site of New Zealand's first Kentucky Fried Chicken restaurant in 1971. Royal Oak Mall was expanded significantly in the 1980s to become a significant source of commerce in the area. Royal Oak was once home to Boyd Zoo, one of the earliest .