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Psilocybe

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Psilocybe
Psilocybe semilanceata
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Hymenogastraceae
Genus: Psilocybe
(Fr.) P.Kumm. (1871)
Type species
Psilocybe semilanceata
(Fr.) P.Kumm. (1871)
Species

List of Psilocybe species

Synonyms[1]
  • Agaricus "trib." Psilocybe Fr. (1821)

Psilocybe (/ˌsaɪloʊˈsaɪbi/ SY-loh-SY-bee)[2] is a genus of gilled mushrooms, growing worldwide, in the family Hymenogastraceae. Many species contain the psychedelic compounds psilocybin and psilocin.

Taxonomy

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Taxonomic history

[edit]
P. tampanensis with spore prints

A 2002 study of the molecular phylogeny of the agarics[3] indicated that the genus Psilocybe as then defined was polyphyletic, falling into two distinct clades that are not directly related to each other. The blue-staining hallucinogenic species constituted one clade and the non-bluing species the other. The previous type species of the genus, Psilocybe montana (now Deconica montana), was in the non-bluing clade, but in 2010 the type species was changed to P. semilanceata, a member of the bluing clade. A 2006 molecular phylogenetic study of the Agaricales by Matheny and colleagues, further demonstrated the separation of the bluing and non-bluing clades of Psilocybe in a larger, strongly supported phylogenetic tree of the Agaricales.[4]

Psilocybe had been placed taxonomically in the agaric family Strophariaceae based upon its spore and pileipellis morphology. The phylogenetic study by Matheny et al., placed the non-bluing Psilocybe and its close relatives in a basal position within the Strophariaceae, a sister taxon to a clade containing the other genera within that family. The bluing Psilocybe, however, form a clade that is sister to Galerina in the newly revised family, Hymenogastraceae that used to be restricted to secotioid, false-truffles.[4] The phylogenetic study by Moncalvo, et al. confirmed that the agaric genus Melanotus is simply a subgroup of the non-bluing Psilocybe, all of which are placed in Deconica, and also pointed to a close relationship between the latter genus and the genera Kuehneromyces and Phaeogalera.[3]

Modern classification

[edit]

In 2007, a paper by Redhead et al. proposed conserving the genus Psilocybe with Psilocybe semilanceata as its type species.[5] The suggestion was accepted by unanimous vote of the Nomenclature Committee for Fungi of the International Botanical Congress in 2010, meaning that P. semilanceata (a member of the bluing clade) now serves as the type species of the genus.[6] Since P. semilanceata is now the type species of the genus, the bluing hallucinogenic clade remained in the genus Psilocybe (Hymenogastraceae) while the non-bluing clade were transferred to the genus Deconica (Strophariaceae).[7] However, it has been demonstrated that P. fuscofulva, a species that used to be known as P. atrobrunnea, belongs to the genus Psilocybe s.s. but does not contain psychotropic compounds.[8] Negative results have also been published for P. fimetaria.[9]

Etymology

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The genus name Psilocybe is a compound of the Greek elements ψιλός (psilós) "bare" / "naked" and κύβη (kúbe) "head" / "swelling",[10] giving the meaning "bare-headed" (i.e. bald) referring to the mushroom's detachable pellicle (loose skin over the cap), which can resemble a bald pate.

Description

[edit]
P. ovoideocystidiata, Washington

Psilocybe fruit bodies are typically small, nondescript mushrooms with a typical "little brown mushroom" morphology. Macroscopically, they are characterized by their small to occasionally medium size, brown to yellow-brown coloration, with a typically hygrophanous cap, and a spore print-color that ranges from lilac-brown to dark purple-brown (though rusty-brown colored varieties are known in at least one species).[11] Hallucinogenic species typically have a blue-staining reaction when the fruit body is bruised. Microscopically, they are characterized by pileipellis with hyphae that run parallel to the pileus surface, forming a cutis, by their lack of chrysocystidia, and by spores that are smooth, ellipsoid to rhomboid to subhexagonal in shape, with a distinct apical germ pore. Ecologically, all species of Psilocybe are saprotrophs, growing on various kinds of decaying organic matter.[12][13]

Distribution and habitat

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Global distribution of over 100 psychoactive species of genus Psilocybe mushrooms[14]: 207 
Approximate known range of Psilocybe cyanescens

Geographically, species in this genus are found throughout the world in most biomes.[15] The greatest species diversity seems to be in the neotropics, from Mesoamerica through Brazil and Chile.[14] Psilocybe are found in a variety of habitats and substrates. Many of the species found in temperate regions, such as Psilocybe cyanescens, seem to have an affinity for landscaped areas mulched with woodchips and are actually rather rare in natural settings removed from human habitation. Contrary to popular belief, only a minority of Psilocybe species, such as P. cubensis and P. subcubensis, grow directly on feces.[16] Many other species are found in habitats such as mossy, grassy, or forest humus soils. Psilocybe arose about 65 million years ago.[17]

Psychoactivity

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Biochemistry and pharmacology

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Psilocybin molecule
Psilocin molecule

The psilocybin molecule is indirectly responsible for the hallucinogenic properties of the Psilocybe. This compound, as well as all other indole alkaloids, are derived from the amino acid tryptophan, being the only amino acid with the indole-amine ring. Tryptophan is converted to tryptamine by decarboxylation.[18] Two methylation steps occur producing DMT, another psychedelic compound.[18] Hydroxylation of this compound produces the more potent hallucinogen psilocin, followed by phosphorylation yielding psilocybin.[18] After ingestion of the psilocybin compound alkaline phosphatases present in the body's digestive system, kidneys, and possibly in the blood readily cleave the phosphoryl ester bond from psilocybin, yielding the hydroxyl compound, psilocin.[19] Psilocin is the chemical primarily responsible for the hallucinogenic effects of the Psilocybe.[19] The blue-staining species of Psilocybe are characterized by the presence of psilocin and psilocybin. This blue-staining reaction occurs after the fruit body has been injured, particularly near the base of the stalk.[20] This reaction is thought to be due to the oxidation of psilocybin after the outer surface of the fruit body has been breached.[21] The degree of bluing in a Psilocybe fruit body roughly correlates with the concentration of psilocin in the mushroom.[22] Psilocybin is chemically far more stable than psilocin, the latter compound being largely lost when the mushroom is heated or dried.[23]

The chemical structure of serotonin, a neurotransmitter, is similar to that of psilocin. The latter differs mainly by the location of one of the hydroxyls, and the addition of two methyl groups that make the molecule lipophilic (fat soluble), ergo capable of crossing the lipid membrane sheaths of the central nervous system.[24] After psilocybin has been ingested and dephosphorylated, to psilocin, the mechanism it uses in the brain has a direct agonist effect on the 5-HT serotonin receptors.[19] To explain this effect, the psilocin molecule essentially mimics the serotonin molecule, binding to the 5-HT receptors and initiating the same response as the serotonin. This effect explains the euphoria experienced by ingestion of this "agonist." Initially, hallucinogens were thought to blockade these serotonin neurotransmitters, but persistent research led to this agonist effect conclusion.[19]

Woolley and Campbell conducted research to determine whether the depletion of the hormone serotonin had a direct effect on mental disorders and that hallucinations might be due to an excess of serotonin.[25] Their results led them to study chemicals analogous to serotonin. They found that the psychoactive chemicals psilocybin and psilocin exhibited serotonin-like effects, however as dosage increased, these compounds acted as serotonin antagonists, psilocybin being comparable to the most potent antagonist yet discovered.[25] This is a plausible basis for the psychological effects of these hallucinogenic compounds.

Even though these chemicals are psychoactive and therefore the basidiomycete deemed toxic, there have been no reports of fatalities or induced internal organ damage directly associated with ingestion of these chemicals.[26] Misidentification of the fruit body could lead to ingestion of a lethal fungus.

Some psychoactive species contain baeocystin, norbaeocystin and β‐carboline monoamine oxidase inhibitors in addition to psilocin and psilocybin.[27]

Medical and psychiatric aspects

[edit]

The medicinal uses of the Psilocybe was recorded by Native Americans of Central America. Shamans, or curanderas would avidly ingest the "sacred mushrooms" for the extrasensory perceptual effects it gave them in order to better assess problems faced in their society.[28] The observed effects of the alkaloids found in these mushrooms has given rise to research into their possible uses for psychiatric medicine.[28] For details on contemporary research, see: Psilocybin: Medical research.

History and ethnography

[edit]
P. zapotecorum, Mexico
Main article: Psilocybin mushrooms

Hallucinogenic species of Psilocybe have a long history of use among the native peoples of Mesoamerica for religious communion, divination, and healing, from pre-Columbian times up to the present day. Hallucinogenic Psilocybe were known to the aboriginal Mexicans as teonanácatl (literally "divine mushroom")[29] and were reportedly served at the coronation of Moctezuma II in 1502. After the Spanish conquest of the Americas, the use of hallucinogenic plants and mushrooms, like other pre-Christian traditions, was forcibly suppressed and driven underground.[30]

By the 20th century, hallucinogenic mushroom use was thought by non-Native Americans to have disappeared entirely. However, in 1955, Valentina Wasson and R. Gordon Wasson became the first Westerners to actively participate in an indigenous mushroom ceremony. The Wassons did much to publicize their discovery, even publishing an article on their experiences in Life in 1957.[31] In 1956, Roger Heim identified the hallucinogenic mushroom that the Wassons had brought back from Mexico as Psilocybe and in 1958, Albert Hofmann first reported psilocin and psilocybin as the active compound in these mushrooms.[32] There is some skepticism as to whether or not these "sacred mushrooms" were actually in the genus Psilocybe. However, according to Heim's research in Mexico, he identified three species of Psilocybe that he believed were used in these native ceremonies. The species identified by Heim were; P. mexicana, P. caerulescens, and P. zapotecorum.[33][34][35] are a variety of Psilocybe mushrooms that make up the teonanácatl group of hallucinogenic mushrooms, including P. cubensis.[36] Isauro Nava Garcia, a Mazatec man, provided guidance to Heim while Heim conducted his field and culture work.[37] Garcia was an avid observer of the fungi in his environment while identifying specific characteristics about the fruit body of the Psilocybe his ancestors utilized, as well as knowing where they could be found.[37]

At present, hallucinogenic mushroom use has been reported among a number of groups spanning from central Mexico to Oaxaca, including groups of Nahua, Mixtecs, Mixe, Mazatecs, Zapotecs, and others.[38]

The popularization of entheogens by Wasson, Timothy Leary, and others has led to an explosion in the use of hallucinogenic Psilocybe throughout the world. By the early 1970s, a number of psychoactive Psilocybe species were described from temperate North America, Europe, and Asia and were widely collected. Books describing methods of cultivating P. cubensis in large quantities were also published. The relatively easy availability of hallucinogenic Psilocybe from wild and cultivated sources has made it among the most widely used of the hallucinogenic drugs.

[edit]
P. mexicana, Mexico
Main article: Legal status of psilocybin mushrooms

The purified chemicals psilocybin and psilocin are listed as Schedule II drugs under the United Nations 1971 Convention on Psychotropic Substances.[39] However, the UN drug treaties do not apply to cultivation, preparation, or international transport of psilocybin mushrooms.

Internationally, the two chemicals are generally considered controlled substances. However, there is much ambiguity about what is considered a "container" of these compounds. In several countries (e.g. Brazil), the chemicals themselves are listed as controlled substances, but the mushrooms that contain the chemicals are not, therefore deemed legal.[40] In the United States, possession of Psilocybe mushroom fruiting bodies is illegal in every state except for Florida. This is because the Supreme Court of Florida does not believe that these mushrooms could "reasonably be found to be containers of the schedule I substance, psilocybin".[41]

In the United States there is no federal law mentioning the possession of Psilocybe spores, this is because only the psilocybin and psilocin compounds are considered Schedule I drugs and there is no presence of these compounds in the spores themselves, only in the fruiting body of the cultivated spores. However, there are several US states that have actually prohibited possession of these spores because they can be cultivated to produce these hallucinogenic, Schedule I drugs. These states includes California, Georgia,[42] and Idaho.[40][43]

However, possession of the spores by a qualified mycologist in California is legal if being put to use for research purposes, which must be approved by Research Advisory Panel.[44] If not authorized by law, possession of spores or cultivation of fruiting bodies of the Psilocybe is punishable to not more than one year in county jail or state prison.[44]

Psilocybin mushrooms as well as other "soft drugs" which are stronger than cannabis but not synthetic, are legally available through smart shops in the Netherlands. Only the truffle form of magic mushrooms (such as P. tampanensis) are currently legal, but these still contain the active ingredients and produce similar effect as the caps and stalks.[45]

Notable species

[edit]
Main article: List of Psilocybe species
Psilocybe semilanceata

See also

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References

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  1. ^ "Psilocybe (Fr.) P. Kumm. :21, 71, 1871". MycoBank. International Mycological Association. Retrieved 2012-12-14.
  2. ^ "psilocybe". Farlex Partner Medical Dictionary. 2012. Retrieved 18 June 2017.
  3. ^ a b Moncalvo JM, Vilgalys R, Redhead SA, Johnson JE, James TY, Catherine Aime M, Hofstetter V, Verduin SJ, Larsson E, Baroni TJ, Greg Thorn R, Jacobsson S, Clémençon H, Miller OK Jr (2002). "One hundred and seventeen clades of euagarics". Molecular Phylogenetics and Evolution. 23 (3): 357–400. doi:10.1016/S1055-7903(02)00027-1. PMID 12099793.
  4. ^ a b Matheny PB, Curtis JM, Hofstetter V, Aime MC, Moncalvo JM, Ge ZW, Slot JC, Ammirati JF, Baroni TJ, Bougher NL, Hughes KW, Lodge DJ, Kerrigan RW, Seidl MT, Aanen DK, DeNitis M, Daniele GM, Desjardin DE, Kropp BR, Norvell LL, Parker A, Vellinga EC, Vilgalys R, Hibbett DS (2006). "Major clades of Agaricales: a multilocus phylogenetic overview". Mycologia. 98 (6): 982–95. doi:10.3852/mycologia.98.6.982. PMID 17486974.
  5. ^ Redhead S, Moncalvo JM, Vilgalys R, Matheny PB, Guzmán-Davalos L, Guzmán G (2007). "Propose to conserve the name Psilocybe (Basidiomycota) with a conserved type". Taxon. 56 (1): 255–7.
  6. ^ Norvell L. (2007). "Report of the Nomenclature Committee for Fungi: 15". Taxon. 59 (1): 291–3. doi:10.1002/tax.591029.
  7. ^ "The genus Deconica (W. G. SM.) P. KARST. in Europe – new combinations" (PDF). Österreichische Zeitschrift für Pilzkunde. 18: 207–10. 2009. Archived from the original (PDF) on 2011-09-30.
  8. ^ Borovička, J.; Oborník, M.; Stříbrný, J.; Noordeloos, M. E.; Sánchez, L. P. & Gryndlger, M. (2014). "Phylogenetic and chemical studies in the potential psychotropic species complex of Psilocybe atrobrunnea with taxonomic and nomenclatural notes" (PDF). Persoonia. 34 (6): 1–9. doi:10.3767/003158515X685283. PMC 4510267. PMID 26240441. Retrieved November 28, 2014.
  9. ^ Gotvaldova, Klara; Borovicka, Jan; Hajkova, Katerina; Cihlarova, Petra; Rockefeller, Alan; Kuchar, Martin (2022). "Extensive Collection of Psychotropic Mushrooms with Determination of Their Tryptamine Alkaloids". International Journal of Molecular Sciences. 23 (22): 14068. doi:10.3390/ijms232214068. ISSN 1422-0067. PMC 9693126. PMID 36430546.
  10. ^ Cornelis S (1826). Schrevelius' Greek lexicon, tr. into Engl. with numerous corrections. p. 358.
  11. ^ Paye Y. (2003). Genesis of the PF Redspore psilocybe. Erowid.org.
  12. ^ Guzmán (1983), p. 22.
  13. ^ Largent DL, Baroni TJ (1988). How to Identify Mushrooms to Genus VI: Modern Genera. Eureka, California: Mad River Press. ISBN 978-0-916422-76-9.
  14. ^ a b 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: 198–280. Archived from the original (PDF) on 2010-06-26. Retrieved 2012-12-15.
  15. ^ Guzmán (1983), pp. 22–32.
  16. ^ Guzmán (1983), p. 31.
  17. ^ Bradshaw, Alexander J.; Ramírez-Cruz, Virginia; Awan, Ali R.; Furci, Giuliana; Guzmán-Dávalos, Laura; Dentinger, Bryn T. M. (2024-01-16). "Phylogenomics of the psychoactive mushroom genus Psilocybe and evolution of the psilocybin biosynthetic gene cluster". Proceedings of the National Academy of Sciences. 121 (3). doi:10.1073/pnas.2311245121. ISSN 0027-8424. PMC 10801892. PMID 38194448.
  18. ^ a b c Leung AY, Paul AG (1968). "Baeocystin and norbaeocystin: new analogs of psilocybin from Psilocybe baeocystis". Journal of Pharmaceutical Sciences. 57 (10): 1667–71. doi:10.1002/jps.2600571007. PMID 5684732.
  19. ^ a b c d Nichols D. (2004). "Hallucinogens". Pharmacology & Therapeutics. 101 (2): 131–81. doi:10.1016/j.pharmthera.2003.11.002. PMID 14761703.
  20. ^ Dewick P. (2009). Medicinal Natural Products. John Wiley & Sons. p. 368.
  21. ^ Stamets, 1996, p. 56.
  22. ^ Stamets, 1996, p. 53. "The bluing reaction is obvious in the more potent species, especially those high in psilocin. In general, the less psilocin there is in a species, the more subtle the bluing reaction."
  23. ^ Gotvaldová, Klára; Hájková, Kateřina; Borovička, Jan; Jurok, Radek; Cihlářová, Petra; Kuchař, Martin (2020). "Stability of psilocybin and its four analogs in the biomass of the psychotropic mushroom Psilocybe cubensis". Drug Testing and Analysis. 13 (2): 439–446. doi:10.1002/dta.2950. ISSN 1942-7611. PMC 9693126. PMID 33119971.
  24. ^ May P. "Psilocybin and Mescaline". University of Bristol. Retrieved 28 November 2011.
  25. ^ a b Woolley DW, Campbell NK (1962). "Serotonin-like and antiserotonin properties of psilocybin and psilocin". Science. 3518. 136 (3518): 777–8. Bibcode:1962Sci...136..777W. doi:10.1126/science.136.3518.777. JSTOR 1708525. PMID 14008293. S2CID 9469483.
  26. ^ Halpern J, Roth BL (2004). "Hallucinogens and dissociative agents naturally growing in the United States". Pharmacology & Therapeutics. 102 (2): 131–8. doi:10.1016/j.pharmthera.2004.03.003. PMID 15163594. S2CID 30734515.
  27. ^ Blei, Felix; Dörner, Sebastian; Fricke, Janis; Baldeweg, Florian; Trottmann, Felix; Komor, Anna; Meyer, Florian; Hertweck, Christian; Hoffmeister, Dirk (2020). "Simultaneous Production of Psilocybin and a Cocktail of β-Carboline Monoamine Oxidase Inhibitors in "Magic" Mushrooms". Chemistry – A European Journal. 26 (3): 729–734. doi:10.1002/chem.201904363. ISSN 1521-3765. PMC 7003923. PMID 31729089.
  28. ^ a b Emmons, Chester W. (Jan–Feb 1961). "Mycology and Medicine". Mycologia. 53 (1): 1–10. doi:10.2307/3756126. JSTOR 3756126. Closed access icon
  29. ^ Wasson RG. (1980). The Wondrous Mushroom: Mycolatry in Mesoamerica. New York, New York: McGraw-Hill. ISBN 978-0-07-068443-0.
  30. ^ Díaz JL. (1977). "Ethnopharmacology of sacred psychoactive plants used by the Indians of Mexico". Annual Review of Pharmacology and Toxicology. 17: 647–75. doi:10.1146/annurev.pa.17.040177.003243. PMID 17363.
  31. ^ Wasson RG. (1957). "Seeking the magic mushroom". Life. No. June 10. article reproduced online Archived 2012-01-14 at the Wayback Machine
  32. ^ Hofmann A, Heim R, Brack A, Kobel HF (1958). "Psilocybin, ein psychotroper Wirkstoff aus mexikanischen Rauschpilz Psilocybe mexicana Heim". Experientia (in German). 14 (3): 107–12. doi:10.1007/BF02159243. PMID 13537892. S2CID 42898430.
  33. ^ Heim R, Wasson G (1956). "Les champignons divinatoires utilises dans les rites des Indiens Mazateques recueillis au cours de leur premier voyage au Mexique, en 1953, par Mme Valentina Pavlovna Wasson and M. R. Gordon Wasson". Comptes Rendus de l'Académie des Sciences (in French). 242: 965, 968.
  34. ^ Heim R, Wasson G (1956). "Les champignons divinatoires recueillis par Mme Valentina Pavlovna Wasson et M. R. Gordon Wasson au cours de leurs missions de 1954 et 1955 dans les pays mije, mazateque, zapoteque et nahua du Mexique meridional et central". Comptes Rendus de l'Académie des Sciences (in French). 242: 1389–95.
  35. ^ Heim R, Wasson G (1957). "Les agarics hallucinogenes du genre Psilocybe". Comptes rendus de l'Académie des sciences (in French). 244: 659–700.
  36. ^ Singer, Rolf (1951). "Diagnoses Fungorum novorum Agaricalium". Lilloa. 22: 472, 506.
  37. ^ a b Singer, Rolf; Smith, Alexander H. (Mar–Apr 1958). "Mycological investigations on teonanacatl, the Mexican hallucinogenic mushroom. Part II. A Taxonomic Monograph of Psilocybe, Section Caerulescentes". Mycologia. 50 (2): 262–303. doi:10.2307/3756197. JSTOR 3756197. Closed access icon
  38. ^ Guzmán G. (2008). "Hallucinogenic mushrooms in Mexico: an overview". Economic Botany. 62 (3): 404–12. doi:10.1007/s12231-008-9033-8. S2CID 22085876.
  39. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2012-08-31. Retrieved 2006-04-03.{{cite web}}: CS1 maint: archived copy as title (link)
  40. ^ a b Erowid. "Legality of Psilocybin Mushroom Spores". Erowid.
  41. ^ "Richard D. Fiske vs. Florida". Erowid.
  42. ^ "Georgia Code-Crimes and Offenses- Title 16, Section 16-13-71".
  43. ^ Idaho Legislature. "Title 37, Chapter 27 Uniform Controlled Substances". Idaho Legislature. Archived from the original on 2016-12-15. Retrieved 2011-12-05.
  44. ^ a b "2005 California Health and Safety Code Sections 11390-11392 Article 7. Mushrooms". Justia US Law. Retrieved 5 December 2011.
  45. ^ van Amsterdam J, Opperhuizen A, van den Brink W (2011). "Harm potential of magic mushroom use: a review". Regulatory Toxicology and Pharmacology. 59 (3): 423–9. doi:10.1016/j.yrtph.2011.01.006. PMID 21256914.
  46. ^ Alexopoulos CJ, Mims CW, Blackwell M (1996). Introductory Mycology. John Wiley and Sons. p. 536. ISBN 978-0-471-52229-4.
  47. ^ Gandy, Sam (2024-06-11). "An Enthusiast's Guide to Psilocybe natalensis". DoubleBlind Mag. Retrieved 2024-06-14.
  48. ^ Bresinsky A, Besl H (1989). A Colour Atlas of Poisonous Fungi: a Handbook for Pharmacists, Doctors, and Biologists. London, UK: Manson Publishing Ltd. pp. 115–6. ISBN 978-0-7234-1576-3.

Cited books

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  • Guzmán G. (1983). The genus Psilocybe: A Systematic Revision of the Known Species Including the History, Distribution and Chemistry of the Hallucinogenic Species. Nova Hedwigia Beihefte. Vol. 74. Berlin, Germany: J. Cramer. ISBN 978-3-7682-5474-8.
  • Stamets P. (1996). Psilocybin Mushrooms of the World: An Identification Guide. Berkeley, California: Ten Speed Press. ISBN 978-0-89815-839-7.

Further reading

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  • Emboden, William A. (1979). Narcotic plants (Rev. and enl ed.). New York: Macmillan. ISBN 0-02-535480-9. OCLC 4832354.
  • Furst, Peter T. (1976). Hallucinogens and culture. San Francisco. ISBN 0-88316-517-1. OCLC 2120984.{{cite book}}: CS1 maint: location missing publisher (link)
  • Haard, Richard; Haard, Karen (1977). Poisonous & hallucinogenic mushrooms (2d ed.). Mayne Island, B.C.: Cloudburst Press. ISBN 0-88930-005-4. OCLC 3131519.
  • McKenna, Terence K. (1993). Food of the gods : the search for the original tree of knowledge : a radical history of plants, drugs, and human evolution. New York: Bantam Books. ISBN 0-553-37130-4. OCLC 45078669.
  • Metzner, Ralph; Darling, Diane (2005). Sacred mushroom of visions : teonanácatl : a sourcebook on the psilocybin mushroom. Rochester, Vt.: Park Street Press. ISBN 978-1-59477-044-9. OCLC 62216799.
  • Ott, Jonathan; Bigwood, Jeremy (1978). Teonanácatl : hallucinogenic mushrooms of North America : extracts from the Second International Conference on Hallucinogenic Mushrooms, held October 27-30, 1977, near Port Townsend, Washington. Seattle: Madrona Publishers. ISBN 0-914842-32-3. OCLC 4135392.
  • Oss, O. T.; Oeric, O. N. (1976). Psilocybin, magic mushroom grower's guide : a handbook for psilocybin enthusiasts. Berkeley, Calif.: And/Or Press. ISBN 0-915904-13-6. OCLC 2647420.
  • Stamets, Paul. (1996). Psilocybin mushrooms of the world : an identification guide. Berkeley, Calif.: Ten Speed Press. ISBN 0-89815-839-7. OCLC 34514700.
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Taxonomy

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History and ethnography

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Other

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