Psilocybin mushrooms are mushrooms which contain the hallucinogenic substances psilocybin, psilocin, baeocystin and norbaeocystin. Major psychedelic drugs include mescaline, LSD, psilocybin, and DMT. Typical psychedelic drugs are hallucinogens including LSD, DMT, cannabis, peyote, and psilocybin mushrooms. Mescaline and many indole alkaloids (such as psilocybin, dimethyltryptamine and ibogaine) have hallucinogenic effect. Mescaline causes cross-tolerance with other serotonergic psychedelics such as LSD and psilocybin. These trials tested the effects of LSD, psilocybin, mescaline, and other psychedelic drugs. Aztecs used the psilocybin mushrooms which contain alkaloids psilocybin and psilocin. They are masses of mycelium that contain the hallucinogenic chemicals psilocybin and psilocin. This mushroom has relatives which contain the hallucinogen psilocybin. The effects of psilocybin mushrooms come from psilocybin and psilocin. They bonded while using LSD and Psilocybin mushrooms. However, mushrooms containing psilocybin and psilocin are not illegal in some parts of the world. However, some users report that "O"-acetylpsilocin's subjective effects differ from those of psilocybin and psilocin. The federal law that specifically banned psilocybin and psilocin was enacted on October 24, 1968. "Psilocybe cyanescens", like many other psilocybin containing mushrooms, is sometimes cultivated.