Hallucinogen is a wrong label for magic mushrooms. Hallucino-Gen means 'creator of unreal visions'. That's not the basic. OK, illusions occur and maybe -- with a very high dose -- occasionally a lost 'hallucination'. Hallucinations are just no basic experience of a magic mushroom trip. DEA and other 'war-ondrug-lords' label disociatives (Ketamnine, PCP), empathiogens (XTC)/MDMA, and psychedelics (psilocybin, lsd, mescaline) as hallucinogens. That's wrong:
The general group of pharmacological agents commonly known as hallucinogens can be divided into three broad categories: psychedelics, dissociatives, and deliriants. These classes of psychoactive drugs have in common that they can cause subjective changes in perception, thought, emotion and consciousness ...
On line version of Tryptamines I Have Known And Loved: The Chemistry Continues, By Alexander and Ann Shulgin - An overview of more than hundred tryptamines (psilocybin is a tryptamine) containing lots of substances with psychedelic properties.
On line version of Phenethylamines I Have Known And Loved: A Chemical Lovestory, By Alexander and Ann Shulgin - An overview of more than hundred phenethylamines (mescaline is a phenethylamine) containing lots of substances with psychedelic properties.