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a genus of hymenomycetous gill fungi. The fruiting body is slender and delicate. At maturity, the cap deliquesces into a black fluid, which was formerly used instead of ink. The mushrooms grow on rich humus and dung; occasionally they grow on trees and wood. The common inky cap (Coprinus atramentarius) and the shaggy mane (C. comatus) are often found in gardens and parks.