For the first time, this book describes a comprehensive treatment of new psychoactive species with their content of indole alkaloids. A detailed comparison is evaluated of the alkaloids from known higher fungi with the new species which were evaluated in the last 30 years Since 1983, the author has been worked in this area and therefore some of the species were detected by his research team for the first time with a mycological diagnosis and described through own ,modern analyses. Many figures and tables yield to a deep understanding of this fascinating species of the fungal world.