Psilocybe cubensis
0 strain-specific clinical trials
Analytical chemistry confirms real psilocybin differences between named P. cubensis strains. But no controlled trial has ever compared their experiential effects between varieties.
Kurzbaum et al., Journal of Fungi, 2025
100+
named P. cubensis varieties, most with no formal alkaloid data
LC-MS/MS
gold-standard method Goff 2024 used to confirm strain psilocybin differences
psiH + psiM
biosynthesis gene variants that explain strain-level psilocybin output
Kurzbaum et al., Journal of Fungi, 2025
View as image ↗Among named Psilocybe cubensis varieties, the Golden Teacher vs. Penis Envy debate is among the oldest in popular mycology. Golden Teacher is gentle and approachable. Penis Envy is extreme. B+ sits in the reliable middle. For decades, none of this characterization rested on analytical data. Psilocybe cubensis is Schedule I in the United States and controlled in most jurisdictions worldwide. This article covers the chemistry and genetics of named cultivar varieties only, with no cultivation instructions, acquisition guidance, or dosing information.
The community consensus about these three strains was built almost entirely on unblinded self-reports. Then in 2024, a group of analytical chemists ran liquid chromatography-tandem mass spectrometry on multiple named P. cubensis strains and produced the first rigorous published potency comparison. The results confirmed what the community had long claimed about Penis Envy, and exposed how little formal data exists for the rest.[1]
For background on the species these strains belong to, see Psilocybe cubensis: The World's Most Cultivated Magic Mushroom.
Key Takeaways
- Goff et al. (2024) used LC-MS/MS (the gold-standard analytical method) to measure psilocybin and psilocin across multiple named P. cubensis strains, confirming that Penis Envy contains significantly higher levels than typical varieties
- Over 100 named P. cubensis varieties exist, but most have never been formally analyzed for alkaloid content, and strain-specific clinical research data is essentially nonexistent (Kurzbaum et al., 2025)
- Golden Teacher and B+ represent typical P. cubensis alkaloid profiles; no independent strain-specific LC-MS/MS data has been published for either variety
- Genetic variation in the psilocybin biosynthesis gene cluster, particularly in the psiH and psiM enzyme-encoding genes, explains why some P. cubensis strains produce different alkaloid ratios (Dörner et al., 2022)
- No randomized controlled trial has compared experiential outcomes between named P. cubensis strains; the entire clinical psilocybin research literature uses synthetic compound, not specific mushroom varieties (Kurzbaum et al., 2025)
- Within any named strain, actual psilocybin content still varies with substrate, growing conditions, and harvest timing, which limits the precision of any strain label
What "Strain" Actually Means in Mushroom Science, and Why It Matters Here
The word "strain" means different things in different biological disciplines. In bacteriology, a strain is a genetically validated, distinct lineage within a species. In plant science, "cultivar" is the formal term for a plant variety selected and maintained for specific traits under a recognized naming system. In P. cubensis, the terminology is much looser.
A 2025 comprehensive review by Kurzbaum and colleagues in the Journal of Fungi examined the strain landscape directly.[2] Their conclusion: most named P. cubensis varieties are phenotypic selections, not formally validated genetic subspecies. They emerged through decades of hobbyist cultivation, where individual cultivators selected specimens for desirable appearances (larger caps, faster growth, distinctive coloring) and propagated those lines. Names like "Golden Teacher" and "Penis Envy" came from these communities, not from any formal taxonomic or regulatory naming process.
This matters for interpreting potency claims. When someone describes Golden Teacher as "moderate potency," they are summarizing a community consensus about a phenotypic selection, not citing a genetically standardized variety with a known alkaloid range. Within any named variety, genetic variability exists. Analytical chemistry can still detect patterns within that variability, and that is exactly what Goff et al. did in 2024.
Golden Teacher, B+, and Penis Envy: The Science-Based Comparison
The table below draws from Goff et al. (2024)[1] and Kurzbaum et al. (2025).[2] No clinical trial has compared experiential outcomes between these strains.
| Variety | Visual Appearance | Psilocybin Content | Genetic Notes | Clinical Research |
|---|---|---|---|---|
| Golden Teacher | Large golden-caramel cap; broad central bump (umbo); medium-thick white stem; classic P. cubensis morphology | Typical P. cubensis range; no strain-specific LC-MS/MS published independently | Standard biosynthesis gene cluster; no reported variants | None; characterized in Kurzbaum 2025 review |
| B+ | Very large caps that become wavy at the edges; vigorous colonizer; often larger fruiting bodies than Golden Teacher | Typical P. cubensis range; no strain-specific LC-MS/MS published independently | Standard biosynthesis gene cluster; no reported variants | None; characterized in Kurzbaum 2025 review |
| Penis Envy | Dense thick white stem; small irregular cap; often absent annulus ring; morphologically distinct from typical P. cubensis | Significantly higher psilocybin and psilocin than typical strains (Goff et al., 2024) | Biosynthesis gene cluster variation consistent with higher alkaloid output (Dörner et al., 2022) | None; potency confirmed analytically only |
For a detailed look at psilocybin content ranges across P. cubensis, see Psilocybin Content in P. cubensis: How Much Is Actually There?. For the morphological features that define P. cubensis (cap, gills, spore print, and the biology of blue bruising), see The Biology of Psilocybe cubensis: Growth, Habitat, and Identification.
Golden Teacher: The Most Recognized Variety and What Its Chemistry Actually Shows
Golden Teacher is the P. cubensis variety that appears most consistently in both popular and scientific literature on named strains. The Kurzbaum 2025 review describes it as one of the most widely recognized and consistently phenotyped named varieties, characterized by its large, golden-caramel cap with a pronounced central bump, a medium-thick white stem, and reliable fruiting characteristics.[2]
Its origin is not formally documented. The name circulated in cultivation communities beginning in the 1980s and 1990s, but no peer-reviewed record traces it to a specific source or collection event. What distinguishes it in popular accounts is a reputation for consistency and a morphology that photographs well, which accounts at least partly for its ubiquity in discussions of P. cubensis.
From an analytical chemistry standpoint, Golden Teacher represents a typical P. cubensis alkaloid profile. No published study has isolated Golden Teacher specimens and run LC-MS/MS on them as a named strain to generate independently reported values. The alkaloid content that applies to Golden Teacher is the general P. cubensis range, with psilocybin as the primary compound and psilocin, baeocystin, norbaeocystin, and aeruginascin in smaller amounts.
The community characterization of Golden Teacher as "beginner-friendly" or "moderate potency" reflects this typical profile rather than any measured deficiency. The published record establishes Golden Teacher as representative of the standard P. cubensis range, not as a specifically low-potency outlier.
B+: The Wide-Capped, Adaptable Variety
B+ is described in the mycological strain literature as a vigorous, large-fruiting variety whose caps become distinctly wavy at the edges as the mushroom matures.[2] Kurzbaum et al. note that B+ reportedly produces larger fruiting bodies than many other named varieties.
Community attribution traces B+ to a cultivator known as "Mr. G" operating in Florida in the 1990s. This is informal history rather than documented taxonomy. Like Golden Teacher, B+ has no published strain-specific alkaloid analysis using modern LC-MS/MS methods. Its alkaloid content reflects the general P. cubensis range, and no published data suggests it is an outlier in either direction.
The significance of B+ in this comparison is what it represents about the broader named-variety landscape. The Kurzbaum 2025 review identifies a recurring pattern: varieties that are widely recognized and distinctly phenotyped, yet essentially uncharacterized at the chemical level beyond what applies to P. cubensis generically.[2] Of the 100-plus named P. cubensis varieties in circulation, formal analytical chemistry data exists for only a small fraction. B+ is among the majority for which community descriptions substitute for published data.
Penis Envy: Where the Analytical Chemistry Gets Genuinely Interesting
Penis Envy is morphologically distinct from standard P. cubensis in ways immediately visible under observation. Where typical P. cubensis varieties have a relatively broad cap atop a moderate stem, Penis Envy shows a dense, thick white stem with a small, irregular cap. In typical P. cubensis, a ring of tissue called an annulus forms on the stem from the partial veil that once covered the developing gills. In Penis Envy specimens, this structure is often absent or poorly defined, marking it as genuinely distinct within the species.
Community attribution traces Penis Envy to material associated with mycologist and author Terence McKenna's Amazon collection, with subsequent development through hobbyist networks. This origin narrative is informal and not documentable through peer-reviewed sources.
The published chemistry, however, is documented. Goff et al. (2024) used liquid chromatography-tandem mass spectrometry (LC-MS/MS), the analytical gold standard for alkaloid quantification, to measure psilocybin and psilocin content across multiple named P. cubensis strains.[1] Penis Envy showed significantly higher psilocybin content than typical strains. The community's longstanding claim that Penis Envy is dramatically more potent is supported by the analytical data.
Community accounts frequently describe a 2-3x potency differential relative to strains like Golden Teacher. The Goff 2024 data confirms the directionality and significance of this difference. What the published record establishes is that the gap is real and analytically measurable, not solely the product of expectation and unblinded self-report.
For a deeper look at the alkaloid data behind this strain's distinctive potency, see Penis Envy Potency: Why This Strain Is Significantly Stronger.
The Genetic Explanation: Why Some P. cubensis Varieties Make More Psilocybin
Psilocybin is not produced by a single enzyme. The mushroom builds it through a sequence of chemical steps, each performed by a specific protein. A 2022 genetic survey by Dörner and colleagues from the Hoffmeister lab mapped the gene cluster responsible for this sequence (the group of genes encoding the enzymes that convert tryptophan into psilocybin) across multiple Psilocybe species and strains.[3]
The pathway uses four core enzyme-encoding genes: psiD, psiK, psiM, and psiH. Each encodes a protein that performs one chemical transformation in the sequence. Dörner et al. found genetic variation within this cluster, particularly in psiH and psiM, that correlates with different alkaloid outputs. Strains with certain variants of these genes produce different ratios of psilocybin, baeocystin, and aeruginascin.
This is the molecular explanation for why two strains of the same species can differ meaningfully in psilocybin content. The difference is not random variation or measurement error. The genetic architecture of the biosynthesis pathway itself differs between strains, and those differences determine how efficiently each strain converts precursors into psilocybin.
What Dörner et al. did not do, and what has not been published, is genotype the specific named cultivar varieties like Penis Envy or Golden Teacher and map those genotypes to specific biosynthesis gene cluster variants. That work would require sequencing multiple specimens of each named variety and analyzing the population genetics. It has not appeared in the peer-reviewed literature. What the Dörner 2022 data establishes is that the genetic machinery for strain-level variation exists and operates, providing the biological basis for what Goff 2024 measured analytically.
If minor alkaloids like baeocystin and aeruginascin interest you, see The Entourage Effect in Magic Mushrooms: Do Minor Tryptamines Matter?, which covers the pharmacological data on how these compounds compare to psilocybin.
What No Clinical Trial Has Ever Compared, and Why That Matters
The entire published psilocybin therapeutic research literature uses synthetic psilocybin, not whole mushrooms and not specific P. cubensis strains. When Johns Hopkins, Imperial College London, or NYU publish results from psilocybin-assisted therapy trials, they use a manufactured compound administered in precisely measured doses. There is no established bridge between those findings and any named P. cubensis variety.
The Kurzbaum 2025 review identifies this as one of the central gaps in the field.[2] Strain-specific clinical data is essentially nonexistent. No trial has randomized participants to Golden Teacher versus Penis Envy versus B+ and measured outcomes. No study has compared subjective ratings between named strains under controlled conditions where participants did not know which variety they received.
This means that the experiential characterizations widely shared in cultivation communities ("Golden Teacher is more visual," "B+ is euphoric," "Penis Envy is more introspective") are based on self-reports in completely unblinded conditions. If someone receives something labeled "Penis Envy" and believes it is dramatically stronger, expectation shapes the experience. Expectation effects in psychedelic settings are large and well-documented, and unblinded self-reports cannot separate them from actual pharmacological differences.
The gap between what analytical chemistry shows (real psilocybin content differences between strains) and what experiential research has demonstrated (nothing strain-specific) is the honest summary of where strain science stands in 2025.
For broader coverage of named varieties across the full P. cubensis landscape, see P. cubensis Varieties: Golden Teacher, B+, Penis Envy, and More.
The Bottom Line
Analytical chemistry confirms that measurable psilocybin content differences exist between named P. cubensis strains, with Penis Envy showing significantly higher levels than typical varieties in Goff et al.'s 2024 LC-MS/MS analysis. The genetic mechanism is documented: variation in the psilocybin biosynthesis gene cluster, particularly in psiH and psiM enzyme-encoding genes, provides a molecular basis for between-strain alkaloid differences (Dörner et al., 2022). What does not exist is clinical trial data comparing named strains directly. All modern therapeutic psilocybin research uses synthetic compound, not specific mushroom varieties, and the experiential characterizations of Golden Teacher, B+, and Penis Envy rest partly on analytical chemistry and largely on unblinded self-reports.
Frequently Asked Questions
Sources & References
- 1RTHM-00879·Goff, Roman et al. (2024). “Determination of psilocybin and psilocin content in multiple Psilocybe cubensis mushroom strains using liquid chromatography - tandem mass spectrometry..” Analytica chimica acta.Study breakdown →PubMed →↩
- 2RTHM-00932·Kurzbaum, Eyal et al. (2025). “Exploring Psilocybe cubensis Strains: Cultivation Techniques, Psychoactive Compounds, Genetics and Research Gaps..” Journal of fungi (Basel.Study breakdown →PubMed →↩
- 3RTHM-00755·Dörner, Sebastian et al. (2022). “Genetic Survey of Psilocybe Natural Products..” Chembiochem : a European journal of chemical biology.Study breakdown →PubMed →↩