Psilocybin Mushrooms · Psilocybe cubensis (cultivar)
B+
B+ is one of the most widely cultivated Psilocybe cubensis strains in North America, having circulated in cultivation communities since at least the early 1990s. It is often identified as one of the largest fruiting P. cubensis cultivars, producing caps that can exceed 12cm in diameter under optimal conditions.
The strain's name is attributed to a Florida cultivator known as 'Mr. G' who developed it, though this provenance cannot be independently verified. Community accounts frequently cite B+ as producing a warm, positive, and visually rich experience relative to other P. cubensis strains — but these characterizations are anecdotal and not supported by controlled pharmacological comparison. Tryptamine profiles between P. cubensis strains differ marginally; subjective experience variability is more likely attributable to set, setting, and individual neurochemistry than to cultivar-specific compound ratios.
Analytical testing of B+ samples from the Psilocybin Cup and similar community-organized assays typically places total tryptamine content in the 0.5–0.85% range — consistent with average P. cubensis potency.
Active Compounds
Psilocybin, Psilocin, Baeocystin, Norbaeocystin
B+ is distinguished by large, caramel-brown caps (often 8–12cm at maturity), with a prominent umbo and a thick, robust stipe. The veil tears cleanly. Spore print is dark purple-brown. Bruising is prominent — cut tissue turns blue-green within minutes as psilocin oxidizes.
As a cultivar, B+ demonstrates above-average substrate tolerance and colonization robustness, making it popular for cultivation research. It fruits prolifically across multiple flushes and handles suboptimal conditions better than many other cultivars.
Legal status: Identical to all P. cubensis — Schedule III in Canada under the CDSA. Research exemptions available through Health Canada Section 56(1).
- Scientific Name
- Psilocybe cubensis (cultivar)
- Potency
- Moderate
- Origin
- Cultivar; parent species native to subtropical Americas and SE Asia