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, Cardiff status in 2006 as a "well-preserved late C19 purpose-built public house particularly rare in preserving much of its original planning in the bar areas". The pub was known for serving its Brains SA beer by gravity from barrels behind the bar, though in the 21st century it is pumped from the cellar, still 'flat' without a creamy head. In 2010 the Royal Oak was the only Cardiff pub to make it onto list of the Top 100 Famous UK pubs, compiled by whisky maker Famous Grouse. Royal Oak, Cardiff The Royal Oak is a Grade II listed public house on