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The content of tryptamine derivatives in Psilocybe semilanceata, a popular hallucinogenic mushroom, was measured by high-performance liquid chromatography. Most of the 52 samples have been collected at several localities in Switzerland during a 1-5 year period. The content of psilocybin and baeocystin varied in the range of 0.21-2.02% and 0.05-0.77%, respectively, whereas only traces of psilocin were present. The variability of the alkaloid level depending on origin, year of collection, size and part of mushrooms is discussed.

The Occurrence of Tryptamine Derivatives in Psilocybe semilanceata