Distribution
Psilocybe semilanceata is considered the most common psilocybin-containing mushroom. In Europe, P. semilanceata has a widespread distribution, and is found in Austria, Belgium, Bulgaria, the Channel Islands, Czech republic, Denmark, Estonia, the Faroe Islands, Finland, France, Germany, Georgia, Hungary, Iceland, Ireland, Italy, Lithuania, Netherlands, Norway, Poland, Romania, Russia, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. It is generally agreed that the species is native to Europe; Watling has demonstrated that there exists little difference between specimens collected from Spain and Scotland, at both the morphological and genetic level.
The mushroom also has a widespread distribution in North America. In Canada it has been collected from British Columbia, New Brunswick, Newfoundland, Nova Scotia, Prince Edward Island and Quebec. In the United States, it is most common in the Pacific Northwest, west of the Cascade Mountains, where it fruits abundantly in autumn and early winter; fruiting has also been reported to occur infrequently during spring months. Charles Horton Peck reported the mushroom to occur in New York in the early 20th century, and consequently, much literature published since then has reported the species to be present in the eastern United States. Gaston Guzman later examined Peck's herbarium specimen, and in his comprehensive 1983 monograph on Psilocybe, concluded that Peck had misidentified it with the species now known as Panaeolina foenisecii. P. semilanceata is much less common in South America, where it has been recorded from southern Brazil, Argentina, Uruguay and Chile. It is also known in Australia (where it may be an introduced species) and New Zealand, where it grows in high-altitude grasslands. In 2000, it was reported from Golaghat, in the Indian state of Assam.
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