Stimulants and Hallucinogens

The natural sources of the main hallucinogens are depicted below. Psilocybin comes from the mushrooms Stropharia cubensis (top left) and Psilocybe mexicana (top right). LSD is synthesized from an alkaloid in ergot (Claviceps purpuren), a fungus that grows on cereal grains; an ergot-infested rye seed is shown (center) together with a larger-scale drawing of the ergot fungus. Mescaline is from the peyote cactus Lophophora williamsii (bottom).