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Psilocybe cubensis
Rusty White
The leucistic cube with the party trick: a pale, ghostly fruitbody that drops a rust-brown print instead of the usual purple-black. A genuine oddity for the slide.
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The short version
Rusty White (also spelled Rusty Whyte) is a leucistic Psilocybe cubensis whose claim to fame is a rust to reddish-brown spore print rather than the species-standard purple-black. By most accounts it was bred on the Shroomery forums by a hobbyist called PastyWhyte, crossing Albino A+ with Colombian Rust Spore. A pale-bodied cube with a distinctly off-colour deposit, which is exactly what makes it a fun collector's slide.
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
- It is a plain Psilocybe cubensis, not a separate species. The leucistic look is a low-pigment variant, not albinism and not a cross-species hybrid.
- Its standout trait is the spore deposit: rust to reddish or clay-brown rather than the dark purple-black almost every other cube drops.
- It is leucistic, meaning the fruitbody is pale and low in pigment but not a true albino. The spores, however, keep their colour.
- By most accounts it is a forum-bred line that combines a pale Albino A+ type body with the rust-coloured spores of a Colombian Rust line.
What the community says
- The story goes that it was bred on the Shroomery forums around 2014 by a hobbyist whose handle was PastyWhyte (sometimes given as Rustywhyte), which is reportedly where the Whyte spelling comes from.
- It is said to have been stabilised over several generations and distributed more widely around 2018, but the early timeline is community recollection rather than documented record.
- Most tellings credit a cross of Albino A+ and Colombian Rust Spore. A minority account names a different breeder and different parents, so treat the exact lineage as contested lore.
- The name is usually read as a simple nod to the rusty spores and the pale, washed-out body, though nobody has nailed down an official origin for it.
The story
The cube that prints the wrong colour
Open almost any Psilocybe cubensis spore print and you get the same thing: a heavy smear of dark purple-black. Rusty White is the one that breaks the pattern. Its deposit comes out rust, reddish or clay-brown, and that single quirk is the whole reason the line exists and the whole reason collectors chase it. It is, genuinely, an oddity on the slide.
By most accounts the line came out of the Shroomery forums, bred by a hobbyist remembered by the handle PastyWhyte (you will also see it written Rustywhyte), which is reportedly why so many vendors spell the strain "Rusty Whyte". The usual telling has the work starting around 2014, crossing a pale Albino A+ type with a Colombian Rust Spore line, then stabilising the result over several generations before it spread more widely around 2018. Take the dates as community memory rather than anything documented.
Leucistic in the body, rusty in the spores. The mushroom turns its pigment dial almost all the way down, then the spores ignore the memo entirely.
Leucistic, not albino, and that matters here
Rusty White is leucistic, which means the fruitbody runs very low on pigment and looks pale and ghostly, but it is not a true albino. The useful detail for a collector is that the reduced pigmentation apparently stops at the flesh and does not reach the spores. Inherited from the rust-spored parent, the spore colour is what survives, so you get the paradox the strain is named for: a washed-out cream mushroom that lays down a coloured print. One more thing to flag: a competing account credits a different breeder and a different parent cross, so the exact pedigree is best treated as lore, not gospel.
The species
Meet Psilocybe cubensis
Rusty White 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
- Rusty White, 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.
Pale, ghostly cap
Cream to off-white, sometimes faintly yellow, smooth and often a touch translucent. It opens from bell-shaped to convex and on to broadly flat, with the centre frequently a shade warmer than the rim. The low pigment is the leucistic trait showing.
White, sturdy stem
Firm and white to cream, matching the pale cap, with a partial veil that leaves a ring (annulus) once the cap expands. Handle it and the stipe tends to bruise blue to blue-green.
Gills that turn rusty, not black
Pale grey when young, then darkening toward a rust or reddish-brown as the spores ripen rather than going purple-black. This is the field tell that separates it from a standard cube.
Blue bruising
Damaged flesh bruises blue-green, the classic Psilocybe reaction as the enzyme turns psilocybin to psilocin and that oxidises into blue pigments. Reportedly intense in this line despite the pale body.
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.
- Expect an off-colour deposit. Unlike a normal cube, the bulk print here lands rust to reddish-brown because this leucistic line apparently kept the spore pigment of its rust-spored parent while losing colour in the flesh. Individual spores under the scope still look like standard cubensis (pale amber alone, darker in mass), so judge the novelty by the colour of the whole deposit rather than any single spore.
- 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
- Rusty White (collector’s cultivar)
- Spore print
- Rust to reddish or clay-brown, not the usual dark purple-black
- 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 study. 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.
That is the whole point of this line. It is leucistic, so the body is low on pigment, but by most accounts the spore colour was inherited from a rust-spored parent and was not bred out. The result is a rust to reddish or clay-brown deposit, which is genuinely unusual for a cubensis.
Both spellings circulate and refer to the same line. The Whyte version reportedly traces to the breeder's forum handle, PastyWhyte. We list it as Rusty White for clarity, but it is the same strain either way.
No. It is leucistic, meaning a pale, low-pigment fruitbody rather than a true albino. The practical difference for a collector is that the spores keep their colour, which is why you still get a visible, coloured print off this one.
Smooth, thick-walled, oval to subellipsoid spores, pale amber individually and darker in mass, each with a small flattened germ pore at one end. The cubensis spore itself looks textbook here; the novelty is the colour of the bulk deposit, not the shape of a single spore. Find them at 100x, study at 400x, and get the wall sharp at 1000x under oil.
Cool, dark and dry. A fridge (not freezer) suits syringes and vials; prints keep happily in a sealed bag somewhere cool. Stored 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.