Fly Agaric (Amanita muscaria)
Psychoactive Amanitas are mushrooms which contain the psychoactive chemicals ibotenic acid and muscimol.
They have a long history of use in Asia and Northern Europe. They are best known for their distinctive appearance bright reds and yellows with white spots.
The Vikings used A.muscaria to enter the "beserker" state for battle. The Icelandic name for the fly agaric contains the word 'berserk' in it.
A.muscaria are cured at source, they are picked and taken to special drying chambers 170-200F this process turns some ibotenic acid into muscimol which is believed to be most active.