The fungal world.
The mushroom you notice is the smallest part of the organism. Essays on fungal life from a single spore to vast mycelial networks together with the full index of psilocybin-producing genera.
A field guide to psilocybin-producing fungi
Psilocybin isn't one mushroom but a trait scattered across at least a dozen unrelated genera convergent evolution, and often the horizontal transfer of the genes that build the molecule. There is no single "magic mushroom": producers range from tiny grassland caps to bright wood-rotting clusters, and they share habitats with some of the deadliest fungi known. Each profile sets out a genus's taxonomy, ecology, and chemistry the species whose psilocybin is documented, and the many still untested or undescribed.
(Psilocybe cubensis) B+
"A grounded profile of the B+ strain of Psilocybe cubensis, sorting the community legend from the documented record across its history, phenotype, grow behavior, and potency reputation."
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(Psilocybe cubensis) Golden Teacher
"An unvarnished, deep-dive into the biology, underground history, and heavy-hitting chemistry of the Golden Teacher (Psilocybe cubensis)".
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(Psilocybe cubensis) Penis Envy
A grounded profile of Penis Envy, separating the documented record from decades of folklore across its contested origin, mutant phenotype, grow behavior, and its unusually well-supported but frequently overstated potency.
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Conocybe
The "conecaps": fragile lawn and dung mushrooms. A few produce psilocybin, but the genus sits beside lethal amatoxin relatives and its taxonomy keeps shifting with Pholiotina.
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Gymnopilus
The "rustgills": bright, bitter, wood-rotting mushrooms. A minority of species produce psilocybin, most famously the large and striking Gymnopilus junonius group.
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Inocybe
The "fibrecaps": a vast, mostly toxic, tree-partnering genus. A few species make psilocybin while many relatives carry dangerous muscarine, a stark lesson in why identification matters.
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Mycena
Tiny forest "bonnets" with white spores. A few minute species reportedly contain psilocybin, placing this huge, mostly untested genus at the frontier of documented producers.
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Panaeolina
Roughened-spored "mower’s mushrooms" split from Panaeolus. The ubiquitous Panaeolina foenisecii has produced contradictory psilocybin results for decades and is at most marginal.
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Panaeolus
The "mottlegills": slender dung and grassland mushrooms with black spores. Several species, notably Panaeolus cinctulus and P. cyanescens, are reliable psilocybin producers.
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Pholiotina
A small genus split from Conocybe with a stark safety lesson: a few psilocybin producers share the genus with the deadly amatoxin mushroom Pholiotina rugosa.
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Pluteus
The "shields": pink-spored wood-rotters. Most are harmless recyclers, but a small group led by Pluteus salicinus produces psilocybin, an unusual outlier among pink-gilled fungi.
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Psilocybe
The most studied genus of psilocybin-producing fungi. Psilocybe contains the species at the centre of research, cultural history, and modern clinical trials.
Browse genusWhy the same chemistry, again and again?
Psilocybin appears in genera that are only distantly related Psilocybe sits far from Pluteus on the fungal tree, yet both make the molecule. Two mechanisms explain this. The first is convergent evolution: separate lineages independently arriving at the same useful trait. The second, supported by genome studies, is horizontal gene transfer the compact psilocybin gene cluster moving sideways between fungi that share the same rich, crowded substrates.
The leading hypothesis for why the trait is favoured concerns insects. The dung and decaying wood where many producers live are swarming with fungus-eating larvae, and psilocybin appears to interfere with insect feeding a chemical deterrent that any fungus in those habitats would benefit from acquiring.
How psilocybin fungi are recognised
Because the producers are spread across unrelated groups, there is no single look. What recurs is a set of features, not an appearance:
- Bluing reaction many active species bruise blue-green where handled, the visible oxidation of psilocin. Suggestive, but not exclusive to psychoactive species.
- Spore print colour dark purple-brown in Psilocybe, jet black in Panaeolus, rusty orange in Gymnopilus, pink in Pluteus. Often the single most useful separating trait.
- Substrate & habitat dung, wood debris, rich grassland soil, leaf litter. Ecology narrows the possibilities before microscopy confirms them.
A note on safety. These profiles are educational. We do not publish identification or foraging guides several psilocybin genera share habitat and appearance with dangerous look-alikes such as the deadly Galerina, and reliable field identification takes years of training and qualified mentorship.
The vocabulary, defined
The working language of mycology, in plain English.
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