Short answer
Psilocybin is produced by more than 200 mushroom species, most in the genus Psilocybe. The best known are Psilocybe cubensis, which grows on cow dung in warm, humid regions including the U.S. Gulf Coast, Mexico, and Southeast Asia; Psilocybe semilanceata, the liberty cap of temperate grasslands in Europe and the Pacific Northwest; and Psilocybe cyanescens and azurescens, which grow on wood debris in the Pacific Northwest. Several deadly mushrooms look similar.
Key takeaways
- About 165 species of Psilocybe, plus species in Panaeolus, Gymnopilus, Inocybe, and a few other genera, contain psilocybin.
- They grow on every continent except Antarctica, usually on dung, grass, or decaying wood.
- Most psilocybin mushrooms bruise blue when handled, but that's not a reliable ID test on its own.
- Some deadly Galerina species look similar and grow in the same places.
How many psilocybin mushrooms are there?
A lot. The genus Psilocybe alone has about 165 known species, and a large 2024 genetic study of the genus found psilocybin production goes back roughly 65 million years.1 Psilocybin also turns up in scattered species of Panaeolus, Gymnopilus, Inocybe, and Pluteus, which is how you get to the 200-plus figure. Some of those unrelated mushrooms seem to have picked up the genes for psilocybin from Psilocybe through horizontal gene transfer, a kind of genetic swap that's more common in fungi than you'd think.2
The main species and where they grow
| Species | Common name | Native range | Habitat |
|---|---|---|---|
| Psilocybe cubensis | Golden teacher, cubes | Tropical and subtropical: U.S. Gulf Coast, Mexico, Central and South America, Caribbean, Southeast Asia, Australia | Cattle dung and rich pastures |
| Psilocybe semilanceata | Liberty cap | Temperate grasslands: Europe, Pacific Northwest, Canada, New Zealand, others | Grassy pastures, often grazed, but not directly on dung |
| Psilocybe cyanescens | Wavy cap | Pacific Northwest, Western Europe, New Zealand | Wood chips and woody debris, often in landscaping |
| Psilocybe azurescens | Flying saucer | Coastal Oregon and Washington | Woody debris and dune grasses near the coast |
| Psilocybe mexicana | Teonanácatl, magic truffles | Mexico, Guatemala | Grassy meadows; forms underground sclerotia |
| Psilocybe caerulescens | Derrumbe | Mexico, Central America | Disturbed soil, landslides, sugarcane mulch |
| Psilocybe subaeruginosa | Subs | Australia | Wood mulch and forest debris |
| Panaeolus cyanescens | Blue meanie | Tropical and subtropical worldwide | Dung |
Ranges and habitats are summarized from Stamets' identification guide and related mycological literature.3 Species distributions keep expanding as people move wood chips, cattle, and spores around the world.
The famous one: Psilocybe cubensis
P. cubensis is the mushroom most people picture. It's relatively large, has a golden-brown cap, and grows on dung in warm, wet climates. It's also the species behind most named varieties, like Golden Teacher and Penis Envy. Read the full profile in Psilocybe cubensis explained.
Why they bruise blue
Damage a psilocybin mushroom and it often turns blue. That's psilocin reacting with oxygen: enzymes in the mushroom link oxidized psilocin molecules into blue pigment chains, a reaction researchers mapped in detail in 2020.4 It's a neat trick and a common feature, but it isn't proof. Some other mushrooms bruise blue too.
The look-alike problem
This is the section to take seriously. Several small brown mushrooms that grow in the same places as psilocybin species are poisonous, and some are deadly. The most dangerous are Galerina species that contain amatoxins, the same toxins found in death caps. They can grow on wood debris right next to wavy caps and look similar to an untrained eye. Amatoxin poisoning symptoms can take six hours or more to appear, by which point serious liver damage may already be underway.5
If someone has eaten a wild mushroom that hasn't been identified by an expert, call Poison Control at 1-800-222-1222 right away, even if they feel fine.
Picking wild psilocybin mushrooms is also illegal in nearly every U.S. state. For the legal picture, see psilocybin laws by state.
Common questions
Do magic mushrooms grow in Florida?
Yes. Psilocybe cubensis and Panaeolus cyanescens grow in cattle pastures across Florida and the Gulf Coast, especially in warm, wet months. Picking or possessing them is illegal in Florida.
Does blue bruising mean a mushroom has psilocybin?
Blue bruising comes from psilocin oxidizing, so it's a common trait of psilocybin mushrooms. But some other mushrooms bruise blue too, and some deadly look-alikes grow alongside psilocybin species. Bruising alone is not a safe identification method.
What's the most potent psilocybin mushroom?
Psilocybe azurescens, native to the Oregon and Washington coast, is often cited as one of the most potent species. Potency varies a lot within every species, though, which is a big reason dosing wild mushrooms is risky.
Sources
- Bradshaw AJ, et al. Phylogenomics of the psychoactive mushroom genus Psilocybe and evolution of the psilocybin biosynthetic gene cluster. PNAS. 2024. doi.org/10.1073/pnas.2311245121
- Reynolds HT, et al. Horizontal gene cluster transfer increased hallucinogenic mushroom diversity. Evolution Letters. 2018. doi.org/10.1002/evl3.42
- Stamets P. Psilocybin Mushrooms of the World: An Identification Guide. Ten Speed Press. 1996.
- Lenz C, et al. Injury-triggered blueing reactions of Psilocybe "magic" mushrooms. Angewandte Chemie. 2020. doi.org/10.1002/anie.201910175
- van Amsterdam J, Opperhuizen A, van den Brink W. Harm potential of magic mushroom use: a review. Regulatory Toxicology and Pharmacology. 2011. doi.org/10.1016/j.yrtph.2011.01.006
This article is for education only and is not medical or legal advice. Psilocybin is a Schedule I substance under U.S. federal law. Talk with a licensed clinician before making decisions about your health. In a crisis, call or text 988.