B+ spore print

B+ is arguably the most famous Psilocybe cubensis strain ever released. Its large, handsome fruiting bodies, forgiving nature and decades-long track record have made it a household name in the cubensis world. Whether you are a seasoned collector or just beginning to explore cubensis genetics, B+ is a strain you will encounter again and again — and for good reason.

The Legendary Origins of B+

The B+ strain first appeared in the late 1990s, introduced to the online mycology community by a Florida-based figure known as Mr. G, who operated through a vendor called Foggy Mountain Farms. Mr. G famously claimed that B+ was a hybrid between Psilocybe cubensis and Psilocybe azurescens — a bold assertion that has never been scientifically validated, since interspecies hybridisation of this kind has not been demonstrated in Psilocybe. Despite the controversy, the strain itself proved exceptional: its size, consistency and adaptability quickly won over collectors and growers alike, and B+ spread rapidly through early spore vendors like Ralphsters Spores and Hawkeye. Today, it remains one of the most distributed cubensis genetics on the planet.

Visual Characteristics of B+

• Cap: Large and broad, typically caramel to golden-brown, fading to lighter tones toward the edges. Convex when young, gradually flattening with age. A thick veil often leaves a prominent skirt on the stem.
• Stem: Thick and sturdy, white to pale, frequently reaching impressive heights of 15–20 cm. Bruises blue when handled.
• Overall appearance: Big, well-proportioned fruits with a warm, inviting colour palette — the classic "postcard" cubensis look that many people picture when they think of magic mushrooms.

The Benchmark Cubensis Strain

B+ has earned a unique status in the cubensis world: it is the strain that other varieties are compared against. When a new or exotic cubensis isolate is introduced, its size, yield and stability are often described relative to B+. This baseline reputation exists because B+ delivers remarkably consistent results across a wide range of conditions and substrates, from grain and straw to manure and coir. It is also a prolific spore depositor, producing dense, dark purple-brown prints that are easy to work with and store.

How to Use a Spore Print

Not sure where to start once your spore print arrives? We have put together a detailed guide that walks you through the entire process, from scraping spores off the print to preparing them for microscopy or long-term storage. Read our step-by-step instructions here: How to Use a Spore Print.

Why Add B+ to Your Collection

If there is one strain that belongs in every Psilocybe cubensis collection, it is B+. Its combination of historical significance, visual beauty and unmatched consistency make it a cornerstone variety. Whether you appreciate the lore surrounding Mr. G, the warm caramel tones of a mature cap, or simply want the most widely recognised cubensis genetics in your library, B+ is the definitive classic that never disappoints.