The Agaricales reference article from the English Wikipedia on 24-Jul-2004
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Agaricales

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Amanita muscaria, also known as Fly agaricEnlarge

Amanita muscaria, also known as Fly agaric

Agarics (also known as "gilled mushrooms") are one of the most familiar types of mushrooms. They range from the deadly Destroying angel to the familiar white mushroom, from the hallucinogenic Fly agaric to the bioluminescent Jack-O-Lantern mushroom, they are ubiquitous to near every place in the world except Antarctica.

Note that many mushrooms, such as chanterelles, have false gills, and are not Agarics.