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Psilocybe cubensis
Texas Yellow Cap
The Texas cube collectors keep coming back to for its colour: vivid golden-yellow caps that drop a heavy, textbook-dark purple-brown print. A low-profile line with a great look and a hazy backstory.
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The short version
Texas Yellow Cap is a pigmented Psilocybe cubensis line prized for its vivid golden-yellow caps. By most accounts it is tied to the earlier Texas Orange Cap, which was reportedly drawn from wild South Texas cubensis around the cattle country near Corpus Christi. Despite the bright caps it drops a perfectly ordinary dark purple-brown print, which makes it a striking but very studyable collector's cube.
Straight talk
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 a plain Psilocybe cubensis. Not an albino, not a hybrid, not a separate species, just a pigmented line selected for its colour.
- Its signature is the cap: a vivid yellow to golden-brown that is far brighter than the usual caramel cubensis, which is exactly why collectors keep it around.
- Despite those bright caps it drops a standard heavy, dark purple-brown to purplish-black spore print like any pigmented cube.
- It is widely described as a low-profile forum line that never went mainstream, so most of what is written about it is collector talk rather than documented record.
What the community says
- The story usually goes that it was created around 1998 by an amateur mycologist in the community, though that origin is repeated vendor to vendor rather than documented, so treat the date and the unnamed isolator as lore.
- It is commonly said to be tied to the Texas Orange Cap, which was reportedly itself domesticated from wild South Texas cubensis collected around 1998 near Nueces County, in the Corpus Christi coastal country.
- The lineage is usually told as a tidy chain from a wild Texas landrace to the Orange Cap and then to the yellow-capped line, but some sources simply call the two 'related' and date both to roughly the same moment. Treat that neat progression as community lore.
- Vendors often hint it may eventually be retired, which makes it sound rare and collectable. That is marketing framing, not a documented fact about the line.
The story
A bright cap with a hazy paper trail
Texas Yellow Cap is one of those cubes where the look is documented far better than the history. The defining trait is plain to anyone who has seen a tray of them: a vivid yellow to golden cap that runs noticeably brighter than the warm caramel most cubensis throw. Beyond the colour it is, by every account that matters, an ordinary Psilocybe cubensis. No albino trait, no leucism, no hybrid claim. Just a pigmented line that someone liked enough to keep.
The backstory is where things get soft. The version passed around most often is that an amateur mycologist created it around 1998, and that it is tied to the earlier Texas Orange Cap, which was itself reportedly pulled from wild cubensis growing in the cattle country of South Texas, near Nueces County and the Corpus Christi coast. It is a tidy story and a believable one. It is also, mostly community lore, repeated from one vendor listing to the next with no primary source behind it, so it is worth holding lightly.
It never had a big launch or a famous name attached. It was a quiet forum line that survived because people liked the colour, and that is most of its story.
Why the colour does not change the print
A bright cap surprises people who expect the spores to match. They do not. The yellow lives in the cap pigment, not in the spores, so Texas Yellow Cap drops the same dark purple-brown to purplish-black print as any pigmented cube, and it deposits it readily. That contrast, a glowing cap over an inky print, is a fair bit of why collectors keep this one on the shelf.
The species
Meet Psilocybe cubensis
Texas Yellow Cap 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
- Texas Yellow Cap, a collector’s cultivar of the species
- Type locality
- Cuba (where it was first named)
How you’d know it
Field marks
These describe the mature mushroom for reference and identification.
Vivid yellow cap
The headline feature: a bright yellow to golden-brown cap, lighter and more saturated than the usual caramel cubensis. Convex and often keeping a low central bump when young, broadening and flattening with age, frequently paler toward the rim.
White, sturdy stipe
White to off-white and fibrous, typical cubensis build, sometimes a little contorted. A leftover partial veil leaves a persistent ring (annulus) that usually ends up dusted purple-brown as spores collect on it.
Gills darkening to purple-brown
Crowded and pale grey when young, ripening through to a dark purplish-brown as the spores mature. The colour of the gills, not the cap, is what predicts the dark print.
Blue bruising
Handle the flesh and it bruises blue-green, the classic Psilocybe reaction as enzymes convert psilocybin to psilocin which then oxidises into blue pigments. Standard for the species and unrelated to the yellow cap.
Where it comes from
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.
The main event
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.
Choose your format
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.
At a glance
The spec sheet
- Species
- Psilocybe cubensis
- Strain
- Texas Yellow Cap (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
Dig deeper
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.
Common questions
Frequently asked
Yes, for microscopy and research. A dormant spore contains no psilocybin or psilocin, so the spores themselves are not a controlled substance in the UK. We sell them strictly for microscopy, taxonomy and collecting, never for cultivation.
No. The yellow pigment is in the cap, not the spores. Under the scope and in a print the spores are the standard dark purple-brown to purplish-black of a pigmented cubensis, and the strain deposits a heavy print readily.
Neither, by every account we found. It is a pigmented Psilocybe cubensis, usually said to be tied to the Texas Orange Cap line, which itself was reportedly drawn from wild South Texas cubensis. No hybrid claim and no albino or leucistic trait are involved.
Smooth, thick-walled, roughly subellipsoid spores, pale amber individually and dark in a mass, each with a small germ pore at one end, sitting on four-spored basidia. Find them at 100x, study at 400x, and get the wall sharp at 1000x under oil.
If you want something that keeps for years on a shelf, take the print. If you want to be at the microscope tonight, take the syringe. The vial and swab sit in between on convenience.
Cool, dark and dry. A fridge (not freezer) is ideal for syringes and vials; prints keep happily in a sealed bag somewhere cool. Kept well, a print stays viable for study for years.
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Questions and answers
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For microscopy, taxonomy and collecting only.Sold for legal research. Not for cultivation. Spores contain no controlled substances. We trust you to be responsible.