Stargazer

Fact vs. legend

There is a lot of folklore around this strain. Here is which bits are real, side by side.

What we actually know

• Genetically it is an ordinary Psilocybe cubensis, the same species as every other cube. No hybrid, no separate species.
• It has circulated for years as a named collector line, often sold as both Stargazer and Inca Stargazer, which by most accounts refer to the same thing.
• It drops a heavy, dark purple-brown spore print and deposits readily, which is exactly what makes it a satisfying line to study.
• The name is usually explained by the way the caps tend to tip slightly upward as they mature, as though gazing skyward.

What the community says

• The popular origin story says it was found near the Inca ruins at Machu Picchu in the Peruvian Andes. There is no documentation for this, and it is best treated as marketing lore.
• Vendors often claim it was used in ceremony by indigenous peoples, though the names cited (such as the Nahua) are Mesoamerican rather than Andean, which muddles the tale considerably.
• It is frequently said to appear in Stamets and Chilton's The Mushroom Cultivator. It does not. The cubensis lines named in that book were Amazonian, Ecuadorian, Matias Romero, Misantla and Palenque.
• An old forum tale even had Nostradamus using these mushrooms for scrying, which is impossible given there are no native cubensis in Europe.
• Many experienced collectors regard Stargazer as essentially a name on a label, since a cube is a cube.

A beautiful name with a very thin paper trail

Stargazer is one of those cubensis lines where the romance is louder than the record. The story you will hear, again and again, is that it was found high in the Peruvian Andes near the Inca ruins of Machu Picchu, and that ancient peoples used it in ceremony. It is a lovely image. It is also, as far as anyone can actually show, undocumented. Treat the whole Andean origin as community lore rather than history.

The tale tends to unravel the moment you tug on it. Some versions credit ceremonial use to the Nahua, who were a Mesoamerican people of Mexico, not Andean Peru, so the geography quietly contradicts itself. Another stubborn claim is that Stargazer is written up in Stamets and Chilton's The Mushroom Cultivator. By most accounts it simply isn't. The cubensis lines that book actually names are Amazonian, Ecuadorian, Matias Romero, Misantla and Palenque, and Stargazer is not among them.

The version is short: Stargazer is a plain Psilocybe cubensis with a great name and a backstory nobody can verify. The mushroom is real. The legend is mostly decoration.

So where does the name come from?

The most repeated and most charming explanation is the simplest one. As the fruitbodies mature, their caps reportedly tend to tip slightly upward, so a flush looks like a little crowd of faces turned toward the sky. Hence Stargazer. Whether that tilt is a genuine quirk of this line or just something a grower noticed once and a vendor ran with, nobody can say for certain. What is not in doubt is that under the microscope it behaves like a healthy, generous cubensis, and that is reason enough to enjoy it for what it is.

Meet Psilocybe cubensis

Stargazer is a collector's line of a single, well-travelled species. Psilocybe cubensis was first written up in 1906 by the American mycologist Franklin Sumner Earle, from a specimen found in a cattle field in Cuba, which is where the name comes from. He originally called it Stropharia cubensis; Rolf Singer moved it into the genus Psilocybe in 1948.

The genus name is a tidy bit of Greek: psilos ("bare") plus kubē ("head"), for the smooth, peelable skin of the cap, so the full name reads roughly as "the bare-headed mushroom from Cuba."

Family

Hymenogastraceae (older books say Strophariaceae)

Genus

Psilocybe (Fr.) P. Kumm., 1871

Species

Psilocybe cubensis (Earle) Singer, 1948

Basionym

Stropharia cubensis Earle, 1906

This product

Stargazer, a collector's cultivar of the species

Type locality

Cuba (where it was first named)

Field marks

These describe the mature mushroom for reference and identification.

Colour-shifting cap

Convex and roughly an inch or two across, reddish-brown when young, then fading to golden brown and finally a pale, almost buttery yellow with age. Often keeps faint flecks of veil tissue on top.

Upturned habit

The trait the name leans on. Mature caps reportedly tend to tilt slightly upward at the margin rather than sitting flat or domed, the look that earned it the Stargazer name. Reported rather than guaranteed.

Slender ringed stem

Pale yellow to off-white, fairly tall and slim, with a partial veil that leaves a ring around the upper stipe. Bruises blue-green where handled, the classic Psilocybe response as psilocin oxidises.

Darkening gills, heavy print

Gills start grey and crowd toward near-black as the spores ripen, dropping a dense, dark purple-brown print. It is a willing, readily depositing line, which is half of why collectors keep it around.

A dung-lover with a wanderer's history

Psilocybe cubensis is coprophilic, a fancy word for dung-loving. In the wild it lives on the droppings of big grazing animals, classically cattle and water buffalo, fruiting from warm, humid pasture. It does not grow on wood and it does not partner with tree roots.

You'll find it across the warm parts of the world: the Gulf Coast of the United States, Mexico, Central and South America, Southeast Asia and Australia. It was named from Cuba, but where the lineage truly began is an open question. A 2026 study describing its closest wild relative in southern Africa suggests the deep roots are Old-World, the mushroom having apparently travelled with grazing herds long before anyone gave it a Latin name.

Under the microscope

This is what you actually bought the spores for. Put a print or a drop from a syringe on a slide and here's what shows up.

• Shape & size. Smooth, thick-walled and subellipsoid, like a slightly squashed rugby ball, roughly 11.5–17 µm long by 8–11 µm wide (the figures Paul Stamets settled on).
• The germ pore. Look for a single pale, flattened dot at one end. That's the one thin spot in the wall where, in nature, a mushroom would begin, and a real cubensis hallmark.
• Pale alone, dark in a crowd. A single spore looks honey-amber with the light behind it; only in a mass do they read deep purple-brown to black. So a near-black print but pale spores on the slide is normal optics, not a dud.
• What you'll need. Find the field at 100×, study shape and the germ pore at 400×, and get the wall crisp at 1000× under oil. A touch of methylene blue or KOH lifts the contrast.
• The legal bit, and why it's true. A dormant spore carries no psilocybin or psilocin at all; that chemistry only appears later in living tissue. That is exactly why the spores are legal to own and study in the UK.

Print, syringe, vial or swab?

Same lab-grade genetics in every option. The honest difference is shelf life versus how soon you're at the scope.

Spore print

Keeps longest

Spores dropped straight onto sterile foil. Stored cool and dry it outlasts everything else here, so it's the one to reach for if you're building a collection to keep for years.

Spore syringe

Ready tonight

Spores suspended in sterile water, ready to go straight onto a slide. The quickest way to be looking down the microscope this evening. Comes in 3 mL and 12 mL.

Vial & swab

Compact

A sealed glass vial is a tidy middle ground; a sterile swab is the most travel-friendly, robust little format for adding a strain to your reference set.

The spec sheet

Species

Psilocybe cubensis

Strain

Stargazer (collector's cultivar)

Spore print

Dark purple-brown to near-black, heavy depositor

Spore shape

Subellipsoid, smooth, thick-walled, with a germ pore

Spore size

~11.5–17 × 8–11 µm

Basidia

Mostly 4-spored, ~20–30 × 7–10 µm

Wild habitat

Coprophilic, on herbivore dung & warm pasture

Climate

Subtropical to tropical

Intended use

Microscopy, research & collecting only

Further reading

Independent, non-commercial sources, no shops, just good information.

• Psilocybe cubensis on Wikipedia: the species overview.
• The genus Psilocybe: taxonomy and the family reshuffle.
• Index Fungorum: the formal nomenclature record.
• Proc. Royal Society B (2026): the African wild-relative study.