Short answer
Psilocybe cubensis is the most widely known psilocybin mushroom. It has a golden-brown cap, grows on dung in warm, humid climates, and was first scientifically described from Cuba in 1906. Popular names like Golden Teacher and Penis Envy are cultivated varieties of this one species. Potency varies between varieties, but it also varies enormously within the same variety, so strain names are a poor guide to strength.
Key takeaways
- Nearly every "strain" you've heard of is a variety of P. cubensis.
- First described in Cuba in 1906. Today it grows wild across the tropics and subtropics, including the U.S. Gulf Coast.
- Licensed programs lab-test their products because strain names say little about strength.
- Potency differences between strains are real but swamped by batch-to-batch variation.
What Psilocybe cubensis looks like
P. cubensis is a medium to large mushroom by psilocybin standards. Typical features include:1
- A cap that starts egg-shaped and opens to a golden-brown or caramel color, often lighter at the edges
- A thick, whitish stem with a membranous ring that's often stained dark by falling spores
- Dark purple-brown to black spore prints
- Blue bruising where the flesh is damaged
That description also fits a number of mushrooms you should never eat, so treat it as natural history, not a field guide. See the look-alike warning in psilocybin mushroom species.
Where it comes from
The species name means "from Cuba." American mycologist Franklin Sumner Earle described it from Cuban specimens in 1906 as Stropharia cubensis, and it was later reclassified into Psilocybe.1 Today it grows wild across the tropics and subtropics: the U.S. Gulf Coast, Mexico, Central and South America, the Caribbean, Southeast Asia, and Australia. It thrives on cattle dung, which has led to a long-running debate about how much its modern range has spread alongside domesticated cattle.
Genetic work on the wider Psilocybe genus suggests the group as a whole is ancient, with psilocybin production dating back around 65 million years.2
What strain names really mean
Here's the thing about strains: almost all of them are P. cubensis. The names describe cultivated varieties selected by growers for traits like size, appearance, yield, or reputed potency.
| Variety | Reputation | What's actually known |
|---|---|---|
| Golden Teacher | Classic, "balanced," beginner-friendly | A widely grown variety with typical cubensis potency, which still varies a lot |
| Penis Envy | Dense, oddly shaped, unusually strong | Often tests above average, but with wide variation between batches |
| B+ | Large and easy to grow | Mostly a grower's favorite. Potency claims are anecdotal |
| Albino varieties | Pale, sometimes said to be stronger | Lack pigment. Potency claims vary widely |
Hobbyist potency testing has found real differences between varieties, but the spread within a single variety, driven by growing conditions, harvest timing, and drying, can be just as big. The practical takeaway: a strain name doesn't tell you how strong a given mushroom is. That's one reason licensed programs lab-test their products.
Cubensis and the law
In Oregon's licensed program, psilocybin products are grown by state-licensed manufacturers and tested before they reach a service center.3 Everywhere else in the U.S., possessing the mushrooms is illegal under federal law, though some cities and Colorado treat personal possession differently.4 Spores, which contain no psilocybin, sit in a legal gray zone covered in is it legal to grow magic mushrooms?
Common questions
Is Penis Envy stronger than Golden Teacher?
Penis Envy has a reputation for being more potent, and some lab testing supports higher average potency. But results vary widely from batch to batch, and growing conditions, harvest timing, and drying matter a lot. A strain name doesn't tell you the dose.
Where did the name cubensis come from?
It means "from Cuba." American mycologist Franklin Sumner Earle described the species from specimens collected in Cuba in 1906, originally naming it Stropharia cubensis. It was later moved to the genus Psilocybe.
Are cubensis spores legal?
Spores don't contain psilocybin, so they aren't federally controlled, and they're legal to buy for microscopy in most states. California, Georgia, and Idaho ban them. Growing them into mushrooms is illegal almost everywhere, with Colorado's personal-cultivation law as a major exception.
Sources
- Stamets P. Psilocybin Mushrooms of the World: An Identification Guide. Ten Speed Press. 1996.
- 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
- Oregon Health Authority. Oregon Psilocybin Services. oregon.gov
- Wikipedia. Legal status of psilocybin mushrooms. Accessed October 2026. wikipedia.org
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.