What Is a Spore Syringe? What’s Inside, What It Looks Like and How Microscopists Use It

By The Spore Source · Updated September 25, 2026

Intended use. Our Psilocybe cubensis spore syringes are sold for microscopy, taxonomy and educational use only. Not for human consumption.

In this guide

• What is inside a spore syringe
• How a spore syringe is made
• What a spore syringe should look like
• Spore syringe sizes (and why “cc” and “mL” are the same)
• Multispore vs. isolated spore syringes
• Spore syringe vs. spore print vs. swab vs. liquid culture
• How microscopists use a spore syringe
• What Psilocybe cubensis spores look like under the microscope
• Handling and safety
• Are spore syringes legal?
• What to look for when buying one
• Frequently asked questions

What is inside a spore syringe

A spore syringe holds only two things.

1. Spores. Millions of them. A spore is the microscopic reproductive cell of a mushroom, roughly the role a seed plays for a plant, though it is a single cell rather than an embryo with a food store. Psilocybe cubensis spores are about 11–17 micrometers long, which is far too small to see individually.
2. Sterile water. Distilled or deionized water that has been sterilized so it contains nothing alive. Its only job is to keep the spores dispersed and easy to dispense.

There are no nutrients, no sugar and no living fungal tissue. A spore syringe is a suspension of dormant cells in clean water, which is why it is not a controlled substance. Stored in the refrigerator, it stays good for up to 90 days (see how long spore syringes last).

How a spore syringe is made

The process is simple to describe and hard to do cleanly, which is why lab preparation matters.

1. A mature specimen’s cap is placed gill-side down on a sterile surface, usually foil or glass, under a cover. Over several hours it drops spores in a pattern that mirrors the gills. That is a spore print.
2. Under sterile conditions, a small amount of the print is scraped into a container of sterile water and agitated until the spores disperse.
3. The suspension is drawn into sterile syringes, which are capped, labeled and sealed.

Every step is a chance for airborne bacteria or mold to get into the water, and a contaminated syringe is useless for microscopy because you can no longer tell what you are looking at. We prepare ours by hand in an ISO-7 cleanroom, and each syringe ships with a sterile needle in its own wrapper. ISO 7 is the cleanroom class used for pharmacy buffer rooms.

What a spore syringe should look like

A good spore syringe holds clear or faintly tinted water with dark specks or small clumps of spores, which disperse when you shake it. Cloudy or milky water, fuzz or cotton-like strands are signs of contamination, and our guide to telling if a spore syringe is contaminated explains each sign. A syringe that looks empty almost never is, especially with pale-spored albino strains, and a single drop at 400× will show hundreds of spores in one field of view.

Spore syringe sizes (and why “cc” and “mL” are the same)

“cc” (cubic centimeter) and “mL” (milliliter) are the same volume; syringe makers print one or the other. A standard spore syringe is a 10 cc syringe, and most vendors fill it to the 10 cc line. A few sell larger syringes, such as 20 cc.

Ours are 10 cc syringes, filled to the 10 cc line. For microscopy, volume mostly determines how many slides you can make: a single slide uses one or two drops, so even a 10 cc syringe is good for dozens of slides. Larger volumes are convenient if you share a syringe across a classroom or a club.

Multispore vs. isolated spore syringes

A multispore syringe holds spores from a print of an ordinary specimen, and an isolated syringe holds spores from one selected genetic line. Both are spores in sterile water, both are legal in the same 46 states, and neither contains living mycelium, so neither is a liquid culture. Our guide to what “isolated” means on a spore syringe explains the difference in detail.

Spore syringe vs. spore print vs. swab vs. liquid culture

The last row is the important one. A liquid culture is not spores. It is live fungal tissue in food, and for a psilocybin-producing species that tissue already contains the compounds the law controls. We sell spore syringes, and only spore syringes, for that reason.

How microscopists use a spore syringe

1. Shake the syringe for ten seconds to disperse the spores.
2. Remove the cap, then screw the sterile needle onto the luer tip.
3. Dispense one drop onto the center of a clean glass slide. A drop is plenty; more just floats the coverslip.
4. Add a coverslip by lowering it at an angle to avoid air bubbles.
5. Start at 100× to find the drop’s edge and focus, then move to 400×, where individual spores are clearly visible. A 1000× oil-immersion objective shows wall thickness and the germ pore.
6. Stain if you like. Spores are visible unstained because of their pigment, but a drop of Congo red or methylene blue increases contrast. Melzer’s reagent is a standard taxonomic test: Psilocybe cubensis spores do not turn blue-black in it (they are “inamyloid”), which helps separate them from some look-alike genera.
7. Measure. An eyepiece reticle calibrated with a stage micrometer lets you record length and width. Measuring twenty or thirty spores and reporting the range is how mycologists describe a species.
8. Cap the syringe and refrigerate it. The used needle goes in a sharps container.

What Psilocybe cubensis spores look like under the microscope

At 400× a Psilocybe cubensis spore is an oval, slightly flattened on one side (mycologists say “subellipsoid”), with a thick, smooth wall and a small pore at one end called the germ pore. In a dense field they look like tiny dark grains of rice; individually they are a translucent purple-brown. Published measurements put them at roughly 11–17 micrometers long by 7–11 wide, which is large for a Psilocybe and one of the features that helps identify the species. A print from a mature specimen is dark purplish-brown in mass.

The named strains you see in vendor catalogs (Golden Teacher, B+, Penis Envy and the rest) are all Psilocybe cubensis, and their spores are not reliably distinguishable from one another under a light microscope. Albino and leucistic varieties are the exception; their spores carry little or no pigment and appear pale or nearly colorless. Comparing a pigmented strain against an albino one on the same slide is one of the more interesting first projects for a new microscopist.

Handling and safety

• Use the sterile needle once and dispose of it in a sharps container. Do not recap a used needle by hand.
• Wash your hands before and after; wear gloves if you want to keep slides clean. Every order includes an alcohol pad. Our starter kit also includes gloves.
• Spore syringes are not for human consumption and are not medicine. Keep them away from children and pets.
• Store capped, bagged and refrigerated; never freeze.

Are spore syringes legal?

In 46 states, yes, because the spores contain no psilocybin or psilocin and are not a controlled substance; the DEA confirmed this in writing in January 2024. Four states have their own spore laws: California restricts them, Florida bans selling, shipping and bringing in spores, and Georgia and Idaho ban them. We do not ship Psilocybe spores to those four. Germinating spores is illegal under federal law everywhere, which is why we sell for microscopy only and do not provide cultivation information. Our state-by-state legal guide has every statute.

What to look for when buying one

• Lab preparation you can see described. A cleanroom or a laminar-flow hood, sterile water, sealed syringes. Vague “made in a clean environment” claims are a flag.
• Species and strain on the label. You should know what you are looking at.
• Fill volume. 10 cc is standard, and every syringe we sell is filled to 10 cc.
• A sterile needle included, in its own wrapper.
• A guarantee. Ours is 30 days against contamination.
• Plain packaging and a vendor that refuses the four restricted states. A vendor that ships to every state is ignoring state law.

Frequently asked questions

What is a spore syringe used for?

Microscopy, taxonomy and education: studying spore shape, size, color and wall structure, learning to identify species by their spores, and building a reference collection. It is the standard format for buying spores because it is clean, dispersed and ready for a slide.

How do spore syringes work?

They are a dispensing tool. Shake to disperse the spores, attach the sterile needle, and put one drop on a slide. The water carries the spores; nothing else is happening inside the syringe.

What is a spore isolate syringe?

A syringe of spores collected from a single, selected genetic line rather than from an ordinary specimen. It is still spores in water, not a living culture.

What is a multispore syringe?

A syringe of spores collected from a print of an ordinary specimen, with the natural genetic variety that implies. Most spore syringes are multispore unless labeled otherwise.

What should a spore syringe look like?

Clear or faintly tinted water with dark specks or small clumps. Not cloudy, not fuzzy, not smelly. It can look almost empty and still hold millions of spores.

How many spores are in a syringe?

Millions. A single print can contain billions, and a syringe carries a fraction of one. A drop on a slide typically shows hundreds of spores per field of view at 400×.

Is a cc the same as a mL?

Yes. “cc” and “mL” are the same unit. Our syringes are 10 cc syringes, filled to the 10 cc line.

How long does a spore syringe last?

Stored in the refrigerator, it stays good for up to 90 days. Never freeze it. Full details are in How long do spore syringes last?

Is a spore syringe the same as liquid culture?

No. A spore syringe is dormant spores in sterile water. A liquid culture is living mycelium in nutrient solution, and for Psilocybe species it is a controlled substance. We sell only spore syringes.

Are spore syringes legal to buy online?

Yes, in 46 states. Not in California, Florida, Georgia or Idaho, and we do not ship there.

Related guides: Spore syringe vs spore print · How many spores are in a syringe · How to make a slide from a spore syringe