B+ Spore Syringe

B+ is the workhorse of the Psilocybe cubensis world. First circulated in the 1990s by the Florida-based cultivator known as Mr. G, B+ was selectively bred for consistency — and three decades later, that reputation has only grown. Dense spore production, stable morphology across generations, and a resilience that makes it one of the most forgiving strains to work with.

Microscopy Characteristics

B+ spores are ellipsoid, approximately 8–9 x 5.5–6 micrometres, with a smooth wall and dark purplish-brown to brown coloration. Spore deposits are dense and uniform — one of the highest-yielding cubensis strains in terms of spore output per fruiting body. Under magnification, B+ spores appear slightly lighter in color than Golden Teacher, with a marginally thinner cell wall. A single syringe can prepare 20–30+ microscope slides.

Strain Background

Developed by Mr. G in Florida through selective breeding for consistency and vigor. The B+ name reportedly references the strain’s universally positive characteristics. It has been in continuous circulation for over 30 years and is one of the two most frequently recommended beginner strains alongside Golden Teacher.

Storage & Handling

Store the B+ spore syringe at 2–8°C (35–46°F) in a dark location. Do not freeze. Viable for 6–12 months when properly refrigerated. Shake gently before use to redistribute settled spore material.

Frequently Asked Questions

How does B+ compare to Golden Teacher for microscopy?
B+ spores are slightly lighter in color (brown vs dark purplish-brown) with a marginally thinner cell wall. B+ also tends to produce denser spore deposits. Both are excellent for learning spore identification — many researchers keep both in their reference collection.

Is B+ a good strain for building a reference slide collection?
Yes. High spore density (20–30+ slides per syringe), consistent morphology across batches, and useful comparison value against other cubensis strains make it essential for any reference library.

Every syringe is prepared in our Canadian cleanroom under 99.99% HEPA-filtered laminar flow hoods and visually inspected under magnification before shipping.