B+ Liquid Culture – Cloud920

About the B+ Liquid Culture

B+ is a well-established Psilocybe cubensis lineage recognised for its robust growth characteristics, elongated stems and caramel-to-golden cap colouration. Cloud920 places this isolate within its Heritage Series, reflecting the strain’s long-standing presence in cultivation and mycological communities.

B+ is also frequently described as one of the more adaptable P. cubensis lineages. Its reputation for vigorous growth and reliable fruiting has made it a familiar reference point for researchers comparing different cubensis genetics. It forms part of the wider Cloud920 cubensis liquid culture collection.

Origin and History of B+

The history of B+ is closely associated with a cultivator known online as “Mr. G”. Early accounts suggested that B+ was a cross between Psilocybe cubensis and Psilocybe azurescens, although this hybrid-origin story has not been supported by subsequent understanding of the strain.

Today, B+ is generally regarded as a P. cubensis cultivar rather than an P. cubensis × P. azurescens hybrid. Its popularity grew substantially through the late 1990s and following decades, helped by its reputation for adaptability, vigorous development and consistent morphology.

The combination of its long history and extensive community documentation is why B+ remains a useful reference strain when comparing established P. cubensis genetics.

What Makes This B+ Culture Distinctive?

Several characteristics make B+ particularly recognisable within the Heritage collection.

The strain is known for its noticeably elongated stems, which commonly develop to around 15–20 cm, although larger specimens have been reported. Its caps generally range from caramel to golden-brown and can measure approximately 2.5–7.6 cm across.

Other characteristic features include:

• Species: Psilocybe cubensis
• Lineage: B+
• Series: Cloud920 Heritage Series
• Cap colour: Caramel to golden-brown
• Stem: Long, relatively slender to moderately thick
• Bruising: Blue
• Spore print: Dark purple-brown
• General reputation: Vigorous and adaptable
• Research interest: Useful for comparative morphological and genetic studies

Researchers interested in comparing B+ with another established Heritage lineage can also explore the Cloud920 McKennaii liquid culture.

B+ Potency Research

Published research demonstrates that P. cubensis strains can vary considerably in their concentrations of psilocybin and other tryptamines. A recent review compiling published strain data lists B+ fruiting bodies at approximately 11.1 ± 2.5 mg/g psilocybin and 0.22 ± 0.09 mg/g psilocin in one laboratory dataset.

Importantly, these figures should not be interpreted as a fixed potency value for every B+ specimen. Research shows substantial variation between individual fruiting bodies and between cultivation conditions, even within the same named strain.

A 2026 Journal of Fungi study found more than seven-fold variation in total tryptamine concentrations across 14 P. cubensis strains under controlled conditions, alongside significant variation between individual mushrooms of the same strain.

For that reason, laboratory measurements from a particular sample should not automatically be presented as a universal specification for every B+ culture.

What You Receive

The Cloud920 B+ liquid culture is supplied as a laboratory-prepared mycelial culture intended for microscopy and mycological research.

Each syringe contains:

• 10 cc Cloud920 B+ liquid culture
• Live B+ mycelium suspended in a sterile nutrient medium
• Sterile syringe format
• Batch-level quality checks for culture viability, sterility and morphology

The culture is prepared under controlled laboratory conditions before being filled and sealed.

Liquid Culture vs Spore Material

A liquid culture differs fundamentally from a conventional spore preparation.

A spore product contains dormant reproductive cells that must germinate before mycelial development begins. A liquid culture, by contrast, contains established fungal mycelium suspended in a nutrient medium.

For microscopy and mycological research, this distinction can make liquid culture particularly useful when researchers want to examine established mycelial characteristics rather than beginning with dormant spores.

Liquid culture also provides a more defined genetic starting point than a conventional multi-spore sample, where numerous individual spores can carry different genetic combinations.

Cloud920 Heritage Series

Cloud920’s Heritage Series focuses on established mushroom genetics with a substantial history within the mycological community.

B+ belongs to this collection because of its long-standing documentation and widespread recognition among P. cubensis researchers and enthusiasts. Its distinctive morphology also makes it useful for comparative observation alongside other established cubensis lineages.

The broader Cloud920 collection includes a range of traditional and specialised fungal cultures, allowing researchers to compare differences in morphology, mycelial behaviour and genetic lineage.

Storage and Handling

For best preservation, keep the B+ liquid culture refrigerated at 2–8 °C and protected from direct light.

Keep the syringe upright in its original packaging when possible and avoid freezing or repeated temperature fluctuations. Always follow the storage period and handling information supplied with the individual product.

Before research use, inspect the culture carefully for any unexpected changes in appearance. If contamination is suspected, do not use the sample.

Microscopy and Mycological Research Only

The Cloud920 B+ liquid culture is supplied exclusively for microscopy and mycological research purposes.

Psilocybe cubensis can contain controlled psychoactive compounds, and legislation concerning possession, cultivation and research differs considerably between European countries. Customers are responsible for checking the laws applicable in their own jurisdiction before purchasing, possessing or using the product.

Frequently Asked Questions

What is the B+ liquid culture?

B+ liquid culture is a laboratory-prepared suspension containing B+ Psilocybe cubensis mycelium. Cloud920 categorises this established lineage within its Heritage Series.

What does B+ look like?

B+ is particularly recognised for its elongated stems and caramel-to-golden-brown caps. Mature specimens can develop comparatively large fruiting structures, making the lineage easy to distinguish from more compact cubensis varieties.

Is B+ a hybrid of Psilocybe cubensis and P. azurescens?

Early community descriptions claimed a hybrid origin, but B+ is generally regarded as a P. cubensis cultivar rather than a confirmed P. cubensis × P. azurescens hybrid.

How should the Cloud920 B+ culture be stored?

Store the syringe refrigerated at 2–8 °C, protected from light and freezing temperatures. Follow the shelf-life information supplied with the individual batch.

Why is B+ included in the Heritage Series?

Cloud920’s Heritage classification reflects the strain’s established history, extensive community documentation and long-standing recognition as a P. cubensis lineage.

Is B+ potency always the same?

No. Published research demonstrates substantial variability in psilocybin and other tryptamine concentrations between individual mushrooms and between growing conditions. Laboratory results should therefore be treated as sample-specific rather than a universal specification.

Is the B+ liquid culture intended for consumption?

No. This product is supplied for microscopy and mycological research only. It is not presented as a food, supplement or product for human consumption.