Amanita muscaria, commonly known as the fly agaric or fly amanita, is a mushroom and psychoactive basidiomycete fungus, one of many in the genus Amanita. Native throughout the temperate and boreal regions of the Northern Hemisphere, Amanita muscaria has been unintentionally introduced to many countries in the Southern Hemisphere, generally as a symbiont with pine and birch plantations, and is now a true cosmopolitan species. It associates with various deciduous and coniferous trees.

A mushroom (or toadstool) is the fleshy, spore-bearing fruiting body of a fungus,above ground,gilled fungi,mycologists,appear overnight, growing or expanding rapidly,mushrooming,low calorie food,source of B vitamins,used in cooking,some varieties poisonous.

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