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
Prix Royal-Oak Classic system. Its original distance was 3,200 metres. The race was renamed the Prix Royal-Oak and shortened to 3,000 metres in 1869. It was named after Royal Oak (foaled 1823), a key stallion in the establishment of thoroughbred breeding in France. Due to the Franco-Prussian War, the race was not run in 1870 and 1871. The Prix Royal-Oak was abandoned throughout World War I, with no running from 1914 to 1918. It was cancelled twice during World War II, in 1939 and 1940. It was staged at Le Tremblay in 1943 and 1944. The event was extended to 3,100 metres