Psilocybinis produced by hundreds of species of fungi, including those of the genus Psilocybe, such as Psilocybe cubensis and Psilocybe semilanceata, and has also been reportedly isolated from about a dozen other genera. Collectively known as psilocybin mushrooms, these are commonly called "boomers," "sacred mushrooms," "magic mushrooms," or more simply "shrooms." Possession, and in some cases usage, of psilocybin or psilocin has been outlawed in most countries across the globe. Proponents of its usage consider it to be an entheogen and a tool to supplement various types of practices for transcendence, including in meditation, psychonautics, and psychedelic psychotherapy. The intensity and duration of entheogenic effects of psilocybin mushrooms are highly variable, depending on species or cultivar of mushrooms, dosage, individual physiology, and set and setting.
