Psilocybin and psilocyn are small, brown or tan mushrooms found throughout the Americas and parts of Europe. Psilocybin-containing mushrooms are easily mistakable for non-psychoactive, inedible, or poisonous mushrooms in the wild, which can make them difficult and hazardous to identify. Hallucinogenic mushrooms, like other species, often grow in piles of manure.
Like LSD, psilocybin produces its effects primarily by inhibiting the actions of serotonin receptors in the brain.
Psychedelic mushrooms have been used for religious purposes since ancient times by native peoples all over the Americas. The active ingredient of the mushrooms, psilocybin, was isolated in the1960s, and can be synthesized in laboratories. In 1968 possession of psilocybin mushrooms was made illegal in the United States.
Psilocybin and psilocyn mushrooms are usually sold dried, in plastic bags. They are eaten plain or in foods, or are drunk in tea.
Psychedelic mushrooms are called Magic Mushrooms, Shrooms, or simply mushrooms.