There are more than 180 species of mushrooms which contain the psychedelic chemicals psilocybin or psilocin. They have a long history of use in Mexico and are currently one of the most popular and commonly available natural psychedelics.
Ethnohistorical sources indicate that teonanacatl, the "divine mushroom" or "flesh of the gods" (Psilocybe mexicana and other species of the genus Psilocybe), was being ritually consumed and used in religious ceremonies in Mexico before the arrival of the Spanish. During the colonial period, the indigenous use of the mushroom was forbidden and brutally suppressed by the Spanish Inquisition. In spite of this, the mushroom cult has survived underground even into the present day. The psychoactive use of Psilocybe mexicana in Indian shamanism was rediscovered at the end of the 1930s. In the late 1950s, it was found that the Mixe Indians of Coadan, Oaxaca, also used Psilocybe mexicana for shamanic purposes (Hoogshagen 1959). Psilocybe mexicana was the first mushroom in which Albert Hofmann discovered the LSD-like substances psilocybin and psilocin (Heim et al. 1958; Hofmann 1958, 1959).
Alcalde, amokia, a-mo-kid (Chinantec), amokya, angelito (Spanish, "little angel"), a-ni, atkat, atka:t (Mixe), chamaquillo (Spanish, "little boy"), cuiya- jo-to-ki (Chatino), di-chi-to-nize azatec), di-nize, hongo sagrado, kong, kongk (Mixe), konk, little bird, mbey-san (Zapotec), mexikanischer kahlkopf, mexikanischer zauberpilz, Mexican liberty cap, Mexican magic mushroom, nashwinmush (Mixe, "earth mushroom" or "world mushroom"), ndi-shi-tjo-ni-se (Mazatec), nize (Mazatec, "little bird"), pajarito (Spanish, "little bird"), piitpa, pi-tpa (Mixe), pi-tpi, pi:tpi, piule de churis,373 teonanacatl, teonanacatl (Aztec), teotlaquilnanacatl (Nahuatl).
This is the dose range for dry Psilocybe Cubensis. Fresh mushrooms are 9/10ths water by weight, and require 10 times the dose. For other types of psilocybes, see http://www.erowid.org/plants/mushrooms/mushrooms_info4.shtml.
Light: 1-2 grams
Common: 2-4 grams
Strong: 4+ grams
Light: 3-7.5 grams
Common: 7.5-12.5 grams
Strong 12.5-15 grams
Heavy: 15+ grams
This will greatly increase intensity, but lower the duration. The comedown is abrupt, yet gentle. Do not expect enough time for introspection.
Grind the mushrooms to a fine powder, then add them to an acidic solution (e.g. 1 tbps lemon juice, 8oz water), and drink on an empty stomach.
Total: 4-8 hours
Psilocybin tends to induce more introspection than other psychedelics.
Illegal in most countries.