This study is a comprehensive catalog of 77 Panaeolus mushroom species worldwide, of which 20 are known to be hallucinogenic and contain psilocybin. Researchers found that these mushrooms are most commonly documented in Asia, South America, and Europe, but many regions have little to no research data. The review highlights significant gaps in our knowledge about where these species exist and which ones truly contain psychoactive compounds, information that is crucial as these fungi become legal in more countries for medical use.