Coprinus atramentarius is a type of mushroom that goes by various synonyms. This species is also known as the common ink cap, inky cap, or tippler's bane. The name ink cap refers to the mushroom's tendency to dissolve into black ink-like fluid as it matures. This species grows in grassy areas, meadows, and on the roadside during the summer months in Europe and North America. While the ink cap has flattened, bell-shaped caps, they become grayish-brown in color with white gills when mature. The inky cap is used in traditional medicine for its anti-inflammatory and antibacterial properties, while its ink has long been used as an ink or dye.