B- (B minus) — Spore Swab Cloud920®

B- (B minus) — the albino side of the B+ family

You know B+ with its caramel caps and dark prints. Now meet its pale sibling. B- (B minus) is an albino isolate from the B+ line, with white to cream caps whose skin cracks open as they mature, much like Iceberg. Under the lens you get pale, light-coloured spores and a thin print, a clean contrast to the classic B+ slide. Your B- (B minus) Spore Swab Cloud920® delivers that reference material in a sealed, sterile vessel.

Origin & Genetics of B- (B minus)

B- (B minus) is a Psilocybe cubensis isolated from the B+ line, the well-known cultivar credited to the American grower Mr. G. Where B+ is fully pigmented, B- carries the albino trait: almost no pigment in cap, stem or spores. The name is a simple play on its parent. Same family, opposite colour. It is still a very new name on the market, with only a single other supplier listing it worldwide, so careful labelling matters for your catalogue.

• Species: Psilocybe cubensis
• Type: cultivated isolate from the B+ line — not wild, not a hybrid
• Parent line: B+ (credited to Mr. G, USA)
• Isolator: not publicly documented
• Naming: "minus" as the albino counterpart of B+ ("plus")
• Genetic Series: Albino / Leucistic — a true albino type

B- (B minus) Morphology & Spore Print

B- (B minus) starts with round, dome-shaped white caps. As they open, they flatten out and curl upwards into wavy shapes, while the cap skin cracks into patches with small dark speckles. Bruising is strong: blue to blue-green on caps and stems, often spreading over large parts of the cap. The gills stay light cream, even on fully opened caps. Stems are thick, white and sturdy, sometimes bent or twisted. As a true albino, B- forms its spores but drops very few of them, so the print is thin and pale.

• Cap colour: white to cream, turning blue-grey to blue-green where bruised
• Cap shape: dome-shaped when young, later flat, wavy and curling upwards
• Cap surface: skin cracks open into patches, with dark speckles
• Gills: light cream, also on mature caps
• Stem: thick, white, sturdy, sometimes bent or twisted
• Bruising: strong, blue to blue-green
• Spore print colour: pale and thin — low spore drop (albino)

B- (B minus) Cultivation Profile (for taxonomy reference)

Cultivation profile is documented here as taxonomic reference material only — this data describes how the strain behaves under lab conditions for identification purposes. B- (B minus) is new enough that most numbers have not been published yet. What is documented: it fruits in dense clusters with many fruits forming at once. Everything else is still open, which makes your own notes extra valuable.

• Fruiting habit: dense clusters, many fruits at once
• Spore drop: low, typical for an albino type
• Growth speed: not yet documented
• Optimal temperature: not yet documented
• Colonisation window: not yet documented
• Documented flushes: not yet documented

B- (B minus) Strain Fingerprint

A quick reference card for your notes and slide labels.

• Strain: B- (B minus)
• Species: Psilocybe cubensis
• Origin: albino isolate from the B+ line (USA)
• Naming: albino counterpart of B+
• Spore print: pale and thin, low spore drop
• Cap: white to cream, cracked skin, wavy and upturned when mature
• Gills: light cream
• Bruising: strong, blue to blue-green
• SKU: MCS.SPSWA.C920-BMIN