Overview
- A University of Florida team reported in Current Biology on Nov. 11 that Galerina indica, a tiny brown mushroom found on mossy palm trunks in Florida wetlands, produces both the psychedelic psilocybin and lethal amatoxins.
- Chemical tests identified multiple amatoxins in G. indica, including a previously undescribed toxin named alpha-proamanitin, alongside measurable psilocybin and related compounds.
- Genomic sequencing located separate gene clusters for psilocybin and amatoxin biosynthesis in the same species and the authors infer horizontal gene transfer as the most likely way psilocybin genes arrived in the lineage.
- The discovery undercuts common field rules such as using blue bruising to identify safe psilocybin mushrooms and increases the risk that people or pets could mistake tiny brown Galerina mushrooms for nonlethal species.
- Researchers say the find highlights how little is known about tropical and subtropical fungal chemistry and calls for broader field sampling, chemical screening, and functional genetic studies to clarify ecological roles and evolutionary timing.