Evolutionary tree of Psilocybe (IMAGE) University of Utah Caption A simplified evolutionary tree for the genus Psilocybe. Clade I and Clade II represent the Psilocybe species with the same gene order patterns within their psilocybin-producing gene clusters. Credit Bryn Dentinger Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. Adaptations must be shared under the same terms. License CC BY-NC-SA Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.