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 tube station line, immediately West of Royal Oak Underground Station, Royal Oak Portal is the Western tunnel entrance for the Crossrail scheme to link East and West London by main-line railway. The station itself is not part of the Crossrail scheme. The strip of land north of Royal Oak station is reportedly under consideration as a possible location for a new coach station to replace Victoria Coach Station. This is strongly opposed by Westminster's main political parties, given the limited capacity of Royal Oak tube station and other local transport links, and the predominantly residential nature of the area. No details have