Spore Prints
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The McKennaii spore print is a single-use microscopy and cultivation tool containing millions of Psilocybe cubensis McKennaii spores deposited on foil. Named after the legendary ethnobotanist Terence McKenna, this strain has earned a reputation among growers for its rock-solid stability and vigorous colonisation — the kind of cultivar that forgives the odd mistake and still delivers dense, healthy flushes. If you've grown Golden Teacher and want something with more visual character, McKennaii is the natural next step.
McKennaii is one of those strains that keeps showing up in grower forums for good reason — it colonises substrate quickly, resists contamination better than many cubensis varieties, and produces consistently across multiple flushes. We've seen first-time cultivators pull respectable harvests from McKennaii when fussier strains like Penis Envy would have stalled out on them. The fruiting bodies tend to be medium-sized with thick stems and rounded caps, often developing a slightly wavy appearance as they mature.
The spore print itself arrives on aluminium foil, sealed and ready for inoculation or microscopy work. Under a microscope at 400x magnification, McKennaii spores appear dark purple-brown, subellipsoid, typically measuring 11–14 x 7–9 micrometres. The print contains millions of spores — more than enough for multiple inoculations or research sessions.
One honest note: spore prints require a bit more handling skill than pre-loaded syringes. You'll need to scrape spores into sterile water yourself or work directly from the print onto agar. If you've never done this before, a spore syringe is more forgiving. But if you want maximum flexibility and shelf life, prints are the way to go — stored properly in a cool, dark, dry place, they remain viable for years.
| Spec | Detail |
|---|---|
| Species | Psilocybe cubensis |
| Strain | McKennaii |
| Format | Spore print on aluminium foil |
| Spore count | Millions per print |
| GMO status | Non-GMO, naturally propagated |
| SKU | SH0117 |
| Colonisation speed | Above average for cubensis |
| Contamination resistance | High — stable genetics |
| Spore colour | Dark purple-brown |
| Storage | Cool, dark, dry — viable for 2+ years |
Complete your cultivation setup with a mushroom grow kit for a fully colonised substrate that's ready to fruit. If you prefer working with liquid inoculation, pair this print with a sterile spore syringe kit — scrape your McKennaii spores into sterile water and you've got a reusable inoculation tool. For microscopy, a basic prepared slide kit rounds out your research bench.
We've been stocking cubensis spores since the early days of the shop, and McKennaii consistently ranks among the top 3 strains customers reorder. The reason is simple: reliability. Where some strains demand laboratory-grade sterile technique and precise temperature windows, McKennaii colonises rye grain, brown rice flour, and coir-based substrates with minimal fuss. Colonisation temperatures between 24–28°C work well, and fruiting happens reliably at 21–24°C with 90%+ humidity.
According to research published in Exploring Psilocybe cubensis Strains (PMC, 2025), preclinical studies have shown more pronounced effects from psilocybin-containing mushroom extracts compared to isolated psilocybin or psilocin alone, supporting the idea that the full spectrum of compounds in the fruiting body matters. This is part of what makes growing your own from spore prints interesting from a research perspective — you're working with the complete genetic profile of the organism, not an isolated extract.
The one thing McKennaii doesn't do well: outdoor cultivation in northern European climates. This is a subtropical species that wants warmth and humidity. A monotub, shotgun fruiting chamber, or grow tent with humidity control is the way to go. Trying to fruit these on a windowsill in November will end in disappointment.
We get asked about McKennaii versus Golden Teacher at least three times a week. Here's the honest breakdown: Golden Teacher is the Honda Civic of cubensis — utterly dependable, well-documented, gentle. McKennaii runs hotter. The fruiting bodies tend to be denser, the colonisation is slightly faster in our experience, and the visual character of the mushrooms themselves is more distinctive — thicker stems, caps that curl and wave at the edges. For a first-ever grow, we'd still point you toward Golden Teacher. For your second grow, McKennaii is where it gets interesting.
A quick word on what "McKennaii" actually means in the strain world: unlike species names, cubensis strain names aren't formally taxonomic. According to research in DNA Authentication and Chemical Analysis of Psilocybe (PMC, 2022), there's been renewed scientific interest in authenticating Psilocybe strains, because commercial naming conventions don't always map neatly onto genetic differences. McKennaii is a well-established cultivar with consistent phenotypic traits, but it's worth knowing that "strain" in the mushroom world is closer to "cultivar" in the plant world than "species."
| Feature | Spore Print | Spore Syringe | Grow Kit (pre-colonised) |
|---|---|---|---|
| Skill level needed | Intermediate | Beginner-friendly | No experience needed |
| Shelf life | 2+ years (dry, cool) | 6–12 months (refrigerated) | Use within weeks |
| Inoculations per unit | Multiple (5–10+) | 3–5 jars per syringe | Single use |
| Sterile technique required | Yes — critical | Yes — moderate | Minimal |
| Best for | Agar work, long-term storage, microscopy | Direct grain inoculation | Fast results, no equipment |
| Flexibility | Highest — make syringes, agar plates, or direct transfers | Moderate | None — just add water |
Psilocybe cubensis contains the psychoactive compounds psilocybin and psilocin. According to research published in The Good, the Bad and the Tasty (PMC, 2017), these compounds were first isolated and characterised decades ago and act primarily on serotonin receptors in the brain. Once ingested, psilocybin is converted by the liver into psilocin — the molecule that actually crosses the blood-brain barrier.
According to a 2020 study on Effects and Safety of Psilocybe cubensis (PMC), results support the safe use of mushrooms under controlled conditions, while cautioning against higher concentrations. And a 2023 review in Global Species Diversity and Distribution of the Psilocybe Genus (PMC) noted that psychedelic fungi have received considerable attention recently due to their promising treatment potential for several psychiatric disorders — though this research is still in relatively early stages, and most clinical work uses standardised psilocybin rather than whole mushrooms.
What does this mean for McKennaii specifically? Like all cubensis strains, the active compound profile centres on psilocybin and psilocin, with trace amounts of baeocystin and norbaeocystin. Potency varies between flushes and growing conditions — substrate nutrition, temperature stability, and harvest timing all influence the final alkaloid content. This natural variability is part of why researchers find spore prints valuable: they allow controlled cultivation from a known genetic starting point.
Typically 5–10 or more, depending on how you use it. If you scrape spores into sterile water to make syringes, a single print can produce multiple 10ml syringes. For agar work, you only need a tiny scraping per plate, so one print lasts even longer.
Keep it sealed in its original packaging in a cool, dark, dry place. A cupboard or drawer at room temperature works fine. Adding a silica gel packet prevents moisture damage. Stored this way, the print stays viable for 2 years or more. Avoid refrigerators — condensation when you open the package can damage spores.
McKennaii is a solid choice for growers with basic sterile technique. It colonises fast and resists contamination well. That said, if you've never worked with spore prints before, a spore syringe or pre-colonised grow kit has a gentler learning curve. McKennaii prints are best for your second or third project.
A spore print is dried spores deposited on foil — long shelf life, maximum flexibility, but requires sterile handling to use. A spore syringe is spores suspended in sterile water, ready to inject directly into grain jars. Syringes are more convenient; prints give you more options and last longer.
Yes. Scrape a small amount of spores onto a glass slide with a drop of water, apply a coverslip, and examine at 400–1000x magnification. McKennaii spores are subellipsoid, dark purple-brown, measuring approximately 11–14 x 7–9 micrometres. The print contains more than enough material for dozens of slides.
Both are Psilocybe cubensis, but McKennaii colonises slightly faster and produces denser fruiting bodies with more distinctive cap morphology. Golden Teacher is the more documented, gentler cultivar — better for absolute beginners. McKennaii is the step up when you want something with more character and vigour.
At 25–27°C, expect full colonisation of grain jars in 10–14 days — slightly faster than average for cubensis. Fruiting pins typically appear 7–10 days after introducing fruiting conditions (lower temperature, fresh air, high humidity). First flush harvests usually come within 3–4 weeks of inoculation.
Last updated: April 2026
Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.
