Common, colloquial terms for psilocybin mushrooms include psychedelic mushrooms, booms, magic mushrooms, shrooms, and mush. Biological genera containing psilocybin mushrooms include Copelandia, Gymnopilus, Inocybe, Mycena, Panaeolus, Pholiotina, Pluteus, and Psilocybe. Psilocybin mushrooms may have been used in ancient religious rites and ceremonies. They may be depicted in Stone Age rock art in Africa and Europe, but are most famously represented in the Pre-Columbian sculptures and glyphs seen throughout Central and South America.
Prehistoric rock art near Villar del Humo, Spain, offers a hypothesis that Psilocybe hispanica was used in religious rituals 6,000 years ago, and that art at the Tassili caves in southern Algeria from 7,000 to 9,000 years ago may show the species Psilocybe mairei.
Hallucinogenic species of the Psilocybe genus have a history of use among the native peoples of Mesoamerica for religious communion, divination, and healing, from pre-Columbian times to the present day. Mushroom stones and motifs have been found in Guatemala. A statuette dating from ca. 200 CE. and depicting a mushroom strongly resembling Psilocybe mexicana was found in a west Mexican shaft and chamber tomb in the state of Colima. A Psilocybe species was known to the Aztecs as teōnanācatl (literally "divine mushroom" - agglutinative form of teōtl (god, sacred) and nanācatl (mushroom) in Náhuatl) and were reportedly served at the coronation of the Aztec ruler Moctezuma II in 1502. Aztecs and Mazatecs referred to psilocybin mushrooms as genius mushrooms, divinatory mushrooms, and wondrous mushrooms, when translated into English. Bernardino de Sahagún reported ritualistic use of teonanácatl by the Aztecs, when he traveled to Central America after the expedition of Hernán Cortés.
After the Spanish conquest, Catholic missionaries campaigned against the cultural tradition of the Aztecs, dismissing the Aztecs as idolaters, and the use of hallucinogenic plants and mushrooms, like other pre-Christian traditions, was quickly suppressed. The Spanish believed the mushroom allowed the Aztecs and others to communicate with devils. In converting people to Catholicism, the Spanish pushed for a switch from teonanácatl to the Catholic sacrament of the Eucharist. Despite this history, in some remote areas, the use of teonanácatl has persisted.
The first mention of hallucinogenic mushrooms in European medicinal literature appeared in the London Medical and Physical Journal in 1799: a man had served Psilocybe semilanceata mushrooms that he had picked for breakfast in London's Green Park to his family. The doctor who treated them later described how the youngest child "was attacked with fits of immoderate laughter, nor could the threats of his father or mother refrain him."
In 1955, Valentina Pavlovna Wasson and R. Gordon Wasson became the first known European Americans to actively participate in an indigenous mushroom ceremony. The Wassons did much to publicize their experience, even publishing an article on their experiences in Life in May 13, 1957. In 1956 Roger Heim identified the psychoactive mushroom that the Wassons had brought back from Mexico as Psilocybe, and in 1958, Albert Hofmann first identified psilocybin and psilocin as the active compounds in these mushrooms.
Inspired by the Wassons' Life article, Timothy Leary traveled to Mexico to experience psilocybin mushrooms firsthand. Upon returning to Harvard in 1960, he and Richard Alpert started the Harvard Psilocybin Project, promoting psychological and religious study of psilocybin and other psychedelic drugs. After Leary and Alpert were dismissed by Harvard in 1963, they turned their attention toward promoting the psychedelic experience to the nascent hippie counterculture.
The popularization of entheogens by Wasson, Leary, authors Terence McKenna and Robert Anton Wilson, and others has led to an explosion in the use of psilocybin mushrooms throughout the world. By the early 1970s, many psilocybin mushroom species were described from temperate North America, Europe, and Asia and were widely collected. Books describing methods of cultivating Psilocybe cubensis in large quantities were also published. The availability of psilocybin mushrooms from wild and cultivated sources has made it among the most widely used of the psychedelic drugs.
At present, psilocybin mushroom use has been reported among some groups spanning from central Mexico to Oaxaca, including groups of Nahua, Mixtecs, Mixe, Mazatecs, Zapotecs, and others. An important figure of mushroom usage in Mexico was María Sabina, who used native mushrooms, such as Psilocybe mexicana in her practice.
Present in varying concentrations in about 200 species of Basidiomycota mushrooms, psilocybin evolved from its ancestor, muscarine, some 10 to 20 million years ago. In a 2000 review on the worldwide distribution of psilocybin mushrooms, Gastón Guzmán and colleagues considered these distributed among the following genera: Psilocybe (116 species), Gymnopilus (14), Panaeolus (13), Copelandia (12), Hypholoma (6), Pluteus (6) Inocybe (6), Conocybe (4), Panaeolina (4), Gerronema (2), Agrocybe (1), Galerina (1) and Mycena (1). Guzmán increased his estimate of the number of psilocybin-containing Psilocybe to 144 species in a 2005 review.
Many of these are found in Mexico (53 species), with the remainder distributed in Canada and the US (22), Europe (16), Asia (15), Africa (4), and Australia and associated islands (19). In general, psilocybin-containing species are dark-spored, gilled mushrooms that grow in meadows and woods of the subtropics and tropics, usually in soils rich in humus and plant debris. Psilocybin mushrooms occur on all continents, but the majority of species are found in subtropical humid forests. Psilocybe species commonly found in the tropics include P. cubensis and P. subcubensis. P. semilanceata, considered the world's most widely distributed psilocybin mushroom, is found in Europe, North America, Asia, South America, Australia and New Zealand, although it is absent from Mexico.
This section needs additional citations for verification. (October 2018) (Learn how and when to remove this template message)
The effects of psilocybin mushrooms come from psilocybin and psilocin. When psilocybin is ingested, it is broken down to produce psilocin, which is responsible for the psychedelic effects. Psilocybin and psilocin create short-term increases in tolerance of users, thus making it difficult to abuse them because the more often they are taken within a short period of time, the weaker the resultant effects are. Psilocybin mushrooms have not been known to cause physical or psychological dependence (addiction). The physical effects tend to appear around 20 minutes after ingestion and will last approximately 6 hours. The effects may include nausea, vomiting, muscle weakness, drowsiness, and lack of coordination, though many of them can be attributed to mold and or mildew that may accompany the drug when purchased through black market means and not grown in sterile or clean growing environments.
As with many psychedelic substances, the effects of psychedelic mushrooms are subjective and can vary considerably among individual users. The mind-altering effects of psilocybin-containing mushrooms typically last from three to eight hours depending on dosage, preparation method, and personal metabolism. The first 3–4 hours of the trip are typically referred to as the 'peak'—in which the user experiences more vivid visuals, and distortions in reality. However, the effects can seem to last much longer to the user because of psilocybin's ability to alter time perception.
In internet surveys, some psilocybin users have reported symptoms of hallucinogen persisting perception disorder, although this is uncommon and a causal connection with psilocybin use is unclear. There is a case report of perceptual disturbances and panic disorder beginning after using psilocybin mushrooms in frequent cannabis users with a pre-existing history of derealization and anxiety.
Sensory effects include visual and auditory hallucinations followed by emotional changes and altered perception of time and space. Noticeable changes to the auditory, visual, and tactile senses may become apparent around 30 minutes to an hour after ingestion, although effects may take up to two hours to take place. These shifts in perception visually include enhancement and contrasting of colors, strange light phenomena (such as auras or "halos" around light sources), increased visual acuity, surfaces that seem to ripple, shimmer, or breathe; complex open and closed eye visuals of form constants or images, objects that warp, morph, or change solid colours; a sense of melting into the environment, and trails behind moving objects. Sounds may seem to have increased clarity—music, for example, can take on a profound sense of cadence and depth. Some users experience synesthesia, wherein they perceive, for example, a visualization of color upon hearing a particular sound.
As with other psychedelics such as LSD, the experience, or 'trip', is strongly dependent upon set and setting. Hilarity, depression, lack of concentration, and muscular relaxation (including dilated pupils) are all normal effects, sometimes in the same trip. A negative environment could contribute to a bad trip, whereas a comfortable and familiar environment would set the stage for a pleasant experience. Psychedelics make experiences more intense, so if a person enters a trip in an anxious state of mind, they will likely experience heightened anxiety on their trip. Many users find it preferable to ingest the mushrooms with friends or people who are familiar with 'tripping'. The psychological consequences of psilocybin use include hallucinations and an inability to discern fantasy from reality. Panic reactions and psychosis also may occur, particularly if a user ingests a large dose. In addition to the risks associated with ingestion of psilocybin, individuals who seek to use psilocybin mushrooms also risk poisoning if one of the many varieties of poisonous mushrooms is confused with a psilocybin mushroom.
Dosage of mushrooms containing psilocybin depends on the potency of the mushroom (the total psilocybin and psilocin content of the mushrooms), which varies significantly both between species and within the same species, but is typically around 0.5–2.0% of the dried weight of the mushroom. A typical low dose of the common species Psilocybe cubensis is about 1.0 to 2.5 g, while about 2.5 to 5.0 g dried mushroom material is considered a strong dose. Above 5 g is often considered a heavy dose with 5.0 grams of dried mushroom often being referred to as a "heroic dose".
A study at Johns Hopkins University found that a dose of 20 to 30mg psilocybin per 70kg occasioning mystical-type experiences brought lasting positive changes to traits including altruism, gratitude, forgiveness and feeling close to others when it was combined with meditation and an extensive spiritual practice support programme.
The concentration of active psilocybin mushroom compounds varies not only from species to species, but also from mushroom to mushroom inside a given species, subspecies or variety. The same holds true even for different parts of the same mushroom. In the species Psilocybe samuiensis, the dried cap of the mushroom contains the most psilocybin at about 0.23%–0.90%. The mycelium contains about 0.24%–0.32%.
Psilocybin mushrooms are regulated or prohibited in many countries, often carrying severe legal penalties (for example, the US Psychotropic Substances Act, the UK Misuse of Drugs Act 1971 and Drugs Act 2005, and in Canada the Controlled Drugs and Substances Act).
Psilocybin and psilocin are listed as Schedule I drugs under the United Nations 1971 Convention on Psychotropic Substances. Schedule I drugs are deemed to have a high potential for abuse and are not recognized for medical use.
Psychoactive mushrooms, in their fresh form, remain legal in some countries, such as Austria.
On November 29, 2008, the Netherlands announced it would ban the cultivation and use of most psilocybin-containing fungi beginning December 1, 2008. While several sorts of mushrooms – most notably the less-strong "truffles" – were probably by omission not placed on the ban list, some smart shops continue their sale. 
Dried mushrooms were classified as illegal, as they were considered a psilocybin-containing preparation.
The UK ban on fresh mushrooms introduced in 2005 came under much criticism, but was rushed through at the end of the 2001-2005 Parliament; until then, magic mushrooms had been sold in the UK.
The US Drug Enforcement Agency places psilocybin among Schedule I drugs in the Controlled Substances Act having a high potential for abuse, no approved medical uses, and having potential to cause severe side effects or poisoning.
New Mexico appeals court ruled on June 14, 2005, that growing psilocybin mushrooms for personal consumption could not be considered "manufacturing a controlled substance" under state law. However, it still remains illegal under federal law. In December 2018, Oregon’s Secretary of State approved a ballot initiative that would make psychedelic mushrooms legal among licensed therapists.
In May 2019, Denver, Colorado, became the first city in the United States to decriminalize psilocybin mushrooms after an ordinance was admitted to the ballot, and narrowly won with 50.6% of the vote. The initiative did not actually legalize mushrooms, but does prohibit Denver from spending any resources to prosecute people for their use or possession. The law applies to adults over the age of 18, and psilocybin remains illegal in Colorado. In June 2019, Oakland became the second US city to decriminalize psilocybin mushrooms by passing a resolution to end criminal penalties for use and possession of psilocybin.
Portugal has decriminalized possession of all recreational drugs (including psilocybin mushrooms) in quantities no more than a ten-day supply of that substance. However cultivation and distribution (buying/selling) are a criminal offense.
Psilocybin is illegal in India. However, enforcement of this prohibition is complicated by the fact that while the compound itself is banned, mushrooms containing the substance are not.
- Carlos Castaneda
- Entheogenic drugs and the archaeological record
- List of psilocybin mushrooms
- List of psychoactive plants
- List of psychoactive plants, fungi, and animals
- Magic truffle
- Medicinal fungi
- Mushroom tea
- Mystical psychosis
- Paul Stamets
- Psychedelic (disambiguation)
- Kuhn, Cynthia; Swartzwelder, Scott; Wilson, Wilkie (2003). Buzzed: The Straight Facts about the Most Used and Abused Drugs from Alcohol to Ecstasy. W.W. Norton & Company. p. 83. ISBN 978-0-393-32493-8.
- Canada, Health (January 12, 2012). "Magic mushrooms - Canada.ca". www.canada.ca. Retrieved December 20, 2017.
- Guzmán G. (2008). "Hallucinogenic mushrooms in Mexico: An overview". Economic Botany. 62 (3): 404–412. doi:10.1007/s12231-008-9033-8.
- Akers, Brian P.; Ruiz, Juan Francisco; Piper, Alan; Ruck, Carl A. P. (2011-02-17). "A Prehistoric Mural in Spain Depicting Neurotropic Psilocybe Mushrooms?1". Economic Botany. 65 (2): 121–128. doi:10.1007/s12231-011-9152-5. ISSN 0013-0001.
- Rush, John A. (2013). Entheogens and the Development of Culture: The Anthropology and Neurobiology of Ecstatic Experience. North Atlantic Books. p. 488. ISBN 978-1-58394-624-4.
- Samorini, G. (1992). "The oldest representations of hallucinogenic mushrooms in the world (Sahara Desert, 9000–7000 B.P.)". Integration. 2 (3): 69–78.
- Stamets (1996), p. 11.
- Stamets (1996), p. 7.
- Hofmann A. (1980). "The Mexican relatives of LSD". LSD: My Problem Child. New York, New York: McGraw-Hill. pp. 49–71. ISBN 978-0-07-029325-0.
- Brande E. (1799). "Mr. E. Brande, on a poisonous species of Agaric". The Medical and Physical Journal: Containing the Earliest Information on Subjects of Medicine, Surgery, Pharmacy, Chemistry and Natural History. 3: 41–44.
- Wasson RG (1957). "Seeking the magic mushroom". Life (May 13): 100–120. article reproduced online
- Heim R. (1957). "Notes préliminaires sur les agarics hallucinogènes du Mexique" [Preliminary notes on the hallucination-producing agarics of Mexico]. Revue de Mycologie (in French). 22 (1): 58–79.
- Hofmann A, Frey A, Ott H, Petrzilka T, Troxler F (1958). "Konstitutionsaufklärung und Synthese von Psilocybin" [The composition and synthesis of psilocybin]. Cellular and Molecular Life Sciences (in German). 14 (11): 397–399. doi:10.1007/BF02160424.
- Hofmann A, Heim R, Brack A, Kobel H (1958). "Psilocybin, ein psychotroper Wirkstoff aus dem mexikanischen Rauschpilz Psilocybe mexicana Heim" [Psilocybin, a psychotropic drug from the Mexican magic mushroom Psilocybe mexicana Heim]. Experientia (in German). 14 (3): 107–109. doi:10.1007/BF02159243. PMID 13537892.
- Lattin, Don (2010). The Harvard Psychedelic Club: How Timothy Leary, Ram Dass, Huston Smith, and Andrew Weil killed the fifties and ushered in a new age for America (1st ed.). New York: HarperOne. pp. 37–44. ISBN 9780061655937.
- Monaghan, John D.; Cohen, Jeffrey H. (2000). "Thirty years of Oaxacan ethnography". In Monaghan, John; Edmonson, Barbara (eds.). Ethnology. Austin, Texas: University of Texas Press. p. 165. ISBN 978-0-292-70881-5.
- Kosentka, P; Sprague, S. L; Ryberg, M; Gartz, J; May, A. L; Campagna, S. R; Matheny, P. B (2013). "Evolution of the Toxins Muscarine and Psilocybin in a Family of Mushroom-Forming Fungi". PLoS ONE. 8 (5): e64646. Bibcode:2013PLoSO...864646K. doi:10.1371/journal.pone.0064646. PMC 3662758. PMID 23717644.
- Guzmán, G.; Allen, J.W.; Gartz, J. (2000). "A worldwide geographical distribution of the neurotropic fungi, an analysis and discussion" (PDF). Annali del Museo Civico di Rovereto: Sezione Archeologia, Storia, Scienze Naturali. 14: 189–280.
- Guzmán G, Allen JW, Gartz J (1998). "A worldwide geographical distribution of the neurotropic fungi, an analysis and discussion" (PDF). Annali del Museo Civico di Rovereto. 14: 207.
- Guzmán, G. (2005). "Species diversity of the genus Psilocybe (Basidiomycotina, Agaricales, Strophariaceae) in the world mycobiota, with special attention to hallucinogenic properties". International Journal of Medicinal Mushrooms. 7 (1–2): 305–331. doi:10.1615/IntJMedMushr.v7.i12.
- Wurst et al. (2002), p. 5.
- Guzmán, G. (1983). The Genus Psilocybe: A Systematic Revision of the Known Species Including the History, Distribution, and Chemistry of the Hallucinogenic Species. Beihefte Zur Nova Hedwigia. 74. Vaduz, Liechtenstein: J. Cramer. pp. 361–2. ISBN 978-3-7682-5474-8.
- Passie, T.; Seifert, J.; Schneider, U.; Emrich, H.M. (2002). "The pharmacology of psilocybin". Addiction Biology. 7 (4): 357–364. doi:10.1080/1355621021000005937. PMID 14578010.
- "Psilocybin Fast Facts". National Drug Intelligence Center. Retrieved April 4, 2007.
- van Amsterdam, J.; Opperhuizen, A.; van den Brink, W. (2011). "Harm potential of magic mushroom use: A review". Regulatory Toxicology and Pharmacology. 59 (3): 423–429. doi:10.1016/j.yrtph.2011.01.006. PMID 21256914.
- Wittmann, M.; Carter, O.; Hasler, F.; Cahn, B.R.; Grimberg, U.; Spring, P.; Hell, D.; Flohr, H.; Vollenweider, F.X. (2007). "Effects of psilocybin on time perception and temporal control of behaviour in humans". Journal of Psychopharmacology. 21 (1): 50–64. doi:10.1177/0269881106065859. PMID 16714323.
- Espiard, M.L.; Lecardeur, L.; Abadie, P.; Halbecq, I.; Dollfus, S. (2005). "Hallucinogen persisting perception disorder after psilocybin consumption: A case study". European Psychiatry. 20 (5–6): 458–460. doi:10.1016/j.eurpsy.2005.04.008. PMID 15963699.
- Schultes, Richard Evans (1976). Hallucinogenic Plants. Illustrated by Elmer W. Smith. New York: Golden Press. p. 68. ISBN 978-0-307-24362-1.
- Ballesteros et al. (2006), p. 175.
- Stamets (1996)
- "Psilocybin Fast Facts". National Drug Intelligence Center, US Department of Justice. Retrieved May 3, 2018. This article incorporates text from this source, which is in the public domain.
- Erowid (2006). "Dosage Chart for Psychedelic Mushrooms" (shtml). Erowid. Retrieved 2006-12-01.
- "Terence McKenna's Last Trip". Wired Magazine. Condé Nast Publications. 1 May 2000. Retrieved 17 September 2017.
- Jesso, James W. (13 June 2013). Decomposing The Shadow: Lessons From The Psilocybin Mushroom. SoulsLantern Publishing. p. 90. ISBN 978-0991943500. Retrieved 17 September 2017.
- Griffiths, Roland R.; et al. (October 2017). "Psilocybin-occasioned mystical-type experience in combination with meditation and other spiritual practices produces enduring positive changes in psychological functioning and in trait measures of prosocial attitudes and behaviors". Journal of Psychopharmacology. 32 (1): 49–69. doi:10.1177/0269881117731279. PMC 5772431. PMID 29020861.
- "Psilocybin (from magic mushrooms) plus meditation and spiritual training leads to lasting changes in positive traits". Research Digest. January 19, 2018. Retrieved February 21, 2019.
- Gartz J, Allen JW, Merlin MD (2004). "Ethnomycology, biochemistry, and cultivation of Psilocybe samuiensis Guzmán, Bandala and Allen, a new psychoactive fungus from Koh Samui, Thailand". Journal of Ethnopharmacology. 43 (2): 73–80. doi:10.1016/0378-8741(94)90006-X. PMID 7967658.
- "List of psychotropic substances under international control" (PDF). International Narcotics Control Board. August 2003. Archived from the original (PDF) on 2005-12-05. Retrieved 2007-06-25. Cite uses deprecated parameter
- "RTÉ News: 'Shrooms to become illegal in Holland". RTÉ News. November 2008. Retrieved November 28, 2008.
- Amsterdam Drugs Laws
- "Psilocybin" (PDF). US Drug Enforcement Agency. 2017. Retrieved 3 August 2019.
- State of New Mexico, Plaintiff-Appellee, v. David Ray Pratt, Defendant-Appellant, 24,387 (Court of Appeals of New Mexico 2005-06-14).
- The Oregonian. "Psychedelic mushroom legalization effort in Oregon gets ballot language approval". Oregon Live. The Oregonian. Retrieved December 4, 2018.
- "Denver Approves Decriminalizing Psilocybin Mushrooms in Unofficial Results, as Public Support for Psychedelic Drug Research Grows". Time. Retrieved May 9, 2019.
- Jason Blevins (20 May 2019). "Denver authorities might be instructed to look the other way on magic mushrooms, but they remain illegal". The Colorado Sun. Retrieved 3 August 2019.
The mushroom remains a federal Schedule 1 controlled substance, prohibited under state and federal law
- Shalby, Colleen. "Oakland becomes 2nd U.S. city to decriminalize magic mushrooms". Los Angeles Times. Retrieved June 5, 2019.
- Branson-Potts, Hailey (June 22, 2019). "How a trip on magic mushrooms helped decriminalize psychedelic plants in a California city". Los Angeles Times. Retrieved June 23, 2019.
- "Drug policy of Portugal", Wikipedia, 2019-05-01, retrieved 2019-07-04
- "Kodai's 'magic shrooms' give you a high - Times of India". The Times of India. Retrieved February 20, 2017.
- Allen, J.W. (1997). Magic Mushrooms of the Pacific Northwest. Seattle: Raver Books and John W. Allen. ISBN 978-1-58214-026-1.
- Ballesteros, S.; Ramón, M.F.; Iturralde, M.J.; Martínez-Arrieta, R. (2006). "Natural Sources of Drugs of Abuse: Magic Mushrooms". In Cole, S.M. (ed.). New Research on Street Drugs. Nova Science Publishers. ISBN 978-1594549618.
- Estrada, A. (1981). Maria Sabina: Her Life and Chants. Ross Erikson. ISBN 978-0915520329.
- Haze, Virginia & Dr. K. Mandrake, PhD. The Psilocybin Mushroom Bible: The Definitive Guide to Growing and Using Magic Mushrooms. Green Candy Press: Toronto, Canada, 2016. ISBN 978-1937866-28-0. www.greencandypress.com.
- Högberg, O. (2003). Flugsvampen och människan (in Swedish). ISBN 978-91-7203-555-3.
- Kuhn, C.; Swartzwelder, S; Wilson, W. (2003). Buzzed: The Straight Facts about the Most Used and Abused Drugs from Alcohol to Ecstasy. New York: W.W. Norton & Company. ISBN 978-0-393-32493-8.
- Letcher, A. (2006). Shroom: A Cultural History of the Magic Mushroom. London: Faber and Faber. ISBN 978-0571227709.
- McKenna, T. (1993). Food of the Gods. Bantam. ISBN 978-0553371307.
- Nicholas, L.G.; Ogame, K. (2006). Psilocybin Mushroom Handbook: Easy Indoor and Outdoor Cultivation. Quick American Archives. ISBN 978-0-932551-71-9.
- Stamets, P. (1993). Growing Gourmet and Medicinal Mushrooms. Berkeley: Ten Speed Press. ISBN 978-1-58008-175-7.
- Stamets, P.; Chilton, J.S. (1983). The Mushroom Cultivator. Olympia: Agarikon Press. ISBN 978-0-9610798-0-2.
- Stamets, P. (1996). Psilocybin Mushrooms of the World. Berkeley: Ten Speed Press. ISBN 978-0-9610798-0-2.
- Wasson, G.R. (1980). The Wondrous Mushroom: Mycolatry in Mesoamerica. McGraw-Hill. ISBN 978-0-07-068443-0.
- Wurst, M.; Kysilka, R.; Flieger, M. (2002). "Psychoactive tryptamines from Basidiomycetes". Folia Microbiologica. 47 (1): 3–27. doi:10.1007/BF02818560. PMID 11980266.
- The Vaults of Erowid - Psilocybin Mushrooms
- International Legal Status of Psilocybin Mushrooms Ananda Schouten, Erowid, 2004
- Hallucinogenic mushrooms EMCDDA, Lisbon, June 2006
- Hallucinogenic mushrooms: the challenge of responding to naturally occurring substances in an electronic age EMCDDA, Drugs in Focus 15