Indigo Milk Cap (Lactarius indigo)
Close-up of the blue-tinted underside of an indigo milk cap
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This bluish-purple beauty oozes an indigo-colored "milk," aka latex, when the mushroom is cut or broken open. It shares its tendency to ooze or "bleed" with all mushrooms in the genus Lactarius. The indigo milk cap can be found in the coniferous and deciduous forests of eastern North America, East Asia, and Central America. The bluer the body, the fresher the specimen.