POISONOUS AND HALLUCINOGENIC MUSHROOMS
by Michael W. Beug Email: beugm@evergreen.edu
The Evergreen State College, Olympia WA
Slide 21.
Psilocybe semilanceata, shown here contains Class
E toxins (Poisindex VI). Psilocybe semilanceata produces altered
states of consciousness 10 to 30 minutes (rarely up to three hours)after ingestion. The active compounds are the tryptamines psilocybin
and psilocin which are found in many species of Psilocybe, Stropharia,
and Panaeolus plus a few species of Conocybe, Inocybe, Gymnopilus,
Pluteus, Mycena, and Psathyrella. A dose of about 12 mg or more
of psilocybin or psilocin can produce vivid hallucinations. Since the amount
of these chemicals in hallucinogenic mushrooms varies from about 0.1% to
over 2% by dry weight, the amount of mushroom that will have a noticeable
effect is also highly variable. With Psilocybe semilanceata, the
active dose corresponds to about 1 gram of dried P. semilanceata
or about 1/3 ounce of fresh mushrooms.
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