Psilocybin mushrooms, or psilocybin-containing mushrooms, commonly known as magic mushrooms or as shrooms, [1] are a type of hallucinogenic mushroom and a polyphyletic informal group of fungi that … Magic mushrooms (“shrooms”) are hallucinogenic mushrooms of the genus psilocybe that contain psilocybin and psilocin, which are naturally occurring psychedelic mind-altering compounds.