How to Make a Psilocybe Cubensis Spore Print: Step-by-Step Guide

Learn how to make a Psilocybe cubensis spore print step by step — plus storage tips, supplies, and how to use your print for microscopy or cultivation.

A Psilocybe cubensis spore print is a collection of spores deposited by a mature mushroom cap onto a sterile surface. Making one is simple, requires minimal equipment, and gives you a genetic archive that can last for years. In fact, properly stored spore prints remain viable for five to ten years or even longer.

Spore prints serve multiple purposes. Mycologists use them for species identification, because the colour and pattern of the deposit reveal important taxonomic information. Cultivators use them as the starting point for agar cultures, liquid cultures, and grain inoculation. Meanwhile, researchers use them for microscopy — studying spore morphology under magnification. Whatever your goal, this guide walks you through the process from start to finish.

What Is a Psilocybe Cubensis Spore Print?

When a mature mushroom opens its cap fully, the gills underneath release millions of microscopic spores. By placing the cap gill-side down on a surface and covering it, you capture those spores in a natural pattern. That deposit — a fine, powdery layer — is your spore print.

Psilocybe cubensis produces dark purplish-brown to nearly black spores. This distinctive colour helps distinguish it from other species. For more background on the species itself, see our guide on what magic mushrooms are and the Psilocybe cubensis Wikipedia entry for detailed taxonomy.

Supplies You Need for a Spore Print

Before you start, gather the following supplies. Sterility matters at every step — contamination ruins both the print and any future cultures you make from it.

How to Make a Psilocybe Cubensis Spore Print: Step by Step

Follow these seven steps carefully. The entire process takes 12 to 24 hours, but active work time is under 10 minutes.

Select a Psilocybe cubensis mushroom with a fully opened cap and dark, visible gills. Timing matters — the cap should have flattened out or even curled slightly upward. If the veil underneath has just broken, that is the ideal moment. Younger mushrooms with closed caps will not release enough spores.

Wipe down your work surface with 70% isopropyl alcohol. Also sterilise your knife or scissors, the aluminium foil, and the glass jar or bowl. Wear sterile gloves throughout. This step prevents contamination, which is the main reason spore prints fail.

Use your sterilised knife to cut the stem as close to the cap as possible. You only need the cap for the spore print. Set the stem aside — you can dry it for other purposes if you wish.

Place the mushroom cap directly onto your sterile aluminium foil with the gills facing down. Aluminium foil works best because it is easy to sterilise, fold, and store. If you prefer, you can also use a glass slide or half-white/half-black paper for identification purposes.

Place a clean glass jar or bowl over the cap to create a humid microclimate. This helps the gills release spores evenly. Then simply wait. After 12 to 24 hours, the spores will have fallen and settled onto the foil in a radial pattern matching the gill structure.

After the waiting period, carefully lift the glass cover first. Then gently remove the mushroom cap from the foil. Beneath it, you will see a fine, powdery deposit — your Psilocybe cubensis spore print. Handle it carefully, because the spores dislodge easily.

Allow the spore print to air-dry completely in a clean environment. This usually takes one to two hours. Once dry, fold the aluminium foil to enclose the print. Place the folded foil packet into a labelled ziplock bag. Write the strain name and date on the label so you can track it later.

How to Store a Spore Print

Proper storage keeps your Psilocybe cubensis spore print viable for years. Follow these guidelines:

What You Can Do With a Spore Print

A Psilocybe cubensis spore print opens up several paths. Here are the most common uses:

Species Identification and Microscopy

Scrape a tiny amount of spore material onto a glass slide, add a drop of sterile water, and examine under a microscope. Spore colour, shape, and size reveal key taxonomic details. Psilocybe cubensis spores measure roughly 11.5–17 × 8–11.5 µm and appear sub-ellipsoid under magnification.

Starting a Culture on Agar

Transfer a small scraping from your print to a nutrient agar plate inside a still air box. Within 3 to 7 days, you should see white mycelial growth. From there, you can make agar-to-agar transfers to purify the culture. Our guide on how to use a spore print covers this process in full detail.

Making a Spore Syringe

Dissolve a small amount of spore material in sterile distilled water to create a spore syringe. You can then use this syringe to inoculate grain jars or bags. Alternatively, you can skip this step and buy ready-made spore syringes directly from our shop.

Creating Liquid Culture

Transfer spore material into a sterile nutrient broth. Over 1 to 2 weeks, mycelium establishes throughout the liquid. This multiplied culture inoculates grain spawn much faster than raw spores. For more on the full cultivation pipeline, see our post on spore print to grain spawn.

Long-Term Genetic Archiving

Spore prints serve as the best long-term format for preserving mushroom genetics. Because they store dry and compact, you can build an entire strain library in a small box. Many serious mycologists keep both prints for archiving and spore vials for active work.

Spore Print vs Other Spore Formats

How does a spore print compare to other ways of storing and using Psilocybe cubensis spores? This table gives you a quick overview:

Common Mistakes When Making a Spore Print

Even though the process is simple, a few mistakes come up repeatedly. Avoid these to get a clean, viable spore print every time:

Spore Print Legal Considerations

Psilocybe cubensis spore prints contain no psilocybin or psilocin — the psychoactive compounds only develop when the mycelium grows and fruits. As a result, spore prints occupy a different legal position than mushrooms themselves in many countries: