Also known as the fly Agaric or the fly Amanita, the Amanita muscaria is a poisonous and psychoactive basidiomycete fungi, which is one of many in the genus Amanita. There are several subspecies, and each of them has a different cap color. These include the yellow-range flavivolata guessowii, formosa, the pink persicina, and the brown regalis (although it is now considered a separate species).

Fly Agaric's are one of the most recognizable and widely encountered in popular culture. They have been featured in children's books, films, garden ornaments, greeting cards, and computer games. This toadstool is associated with the famous book turned movie, Alice in Wonderland; the mushroom in Super Mario Bros., and more. It is also known as the mushroom of flies from due to Albertus Magnus' work in De vegetabilibus where he stated, “It is called the mushroom of flies, because crushed in milk it kills flies”.