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Q: What is a magic mushroom?  

Krishna: Psilocybin mushrooms, commonly known as magic mushrooms are a polyphyletic, informal group of fungi that contain psilocybin which turns into psilocin. Biological genera containing psilocybin mushrooms include Copelandia, Gymnopilus, Inocybe, Panaeolus, Pholiotina, Pluteus, and Psilocybe. Psilocybin mushrooms had been used in religious rituals some 6000 years ago (1) and continue to be used in indigenous New World cultures in religious or spiritual contexts. The 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. The first mention of hallucinogenic mushrooms in European medicinal literature was in the London Medical and Physical Journal in 1799 (2)  . 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 (3).  

Present in varying concentrations in about 200 species of Basidiomycota mushrooms, psilocybin evolved from its ancestor, muscarine, some 10 to 20 million years ago . Many of them are found in Mexico (53 species), with the remainder distributed throughout Canada and the US (22), Europe (16), Asia (15), Africa (4), and Australia and associated islands (19).  P. semilanceata, considered the world's most widely distributed psilocybin mushroom,[22] is found in temperate parts of Europe, North America, Asia, South America, Australia and New Zealand, although it is absent from Mexico (4). 

The effects of psilocybin mushrooms come from psilocybin and psilocin. When psilocybin is ingested, it is broken down by the liver in a process called dephosphorylation. The resulting compound is called psilocin, which is responsible for the psychedelic effects. Psilocybin and psilocin create short-term increases in tolerance of users. Psilocybin mushrooms have not been known to cause physical or psychological dependence (addiction). The psychedelic effects tend to appear around 20 minutes after ingestion and can last up to 6 hours. Physical effects including nausea, vomiting, euphoria, muscle weakness or relaxation, drowsiness, and lack of coordination may occur.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 after ingestion are typically referred to as the 'peak'—in which the user experiences more vivid visuals and distortions in reality. The effects can seem to last much longer to the user because of psilocybin's ability to alter time perception (5).

Hallucinatory effects: These 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. 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. 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 (6).  

Footnotes:

1. 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 Botany65 (2): 121–128. doi:10.1007/s12231-011-9152-5ISSN 0013-0001S2CID 3955222.
2.  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 History3 (11): 41–44. PMC 5659401PMID 30490162.
3. Guzmán G. (2008). "Hallucinogenic mushrooms in Mexico: An overview". Economic Botany62 (3): 404–412. doi:10.1007/s12231-008-9033-8S2CID 22085876
4. 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 Mushrooms7 (1–2): 305–331. doi:10.1615/intjmedmushr.v7.i12.280.
5. 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 Psychopharmacology21 (1): 50–64. doi:10.1177/0269881106065859PMID 16714323S2CID 3165579.
6. "Kodai's 'magic shrooms' give you a high - Times of India"The Times of India. Retrieved February 20, 2017.

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