Psilocybe tampanensis

A mushroom known by its underground body

Psilocybe tampanensis is an unremarkable-looking small tan mushroom — but it is famous for what it does below ground. Under stress it forms sclerotia: hard, compact masses of fungal tissue, containing psilocybin, that can survive drought and fire. These are the “magic truffles” of the trade, and they are why the species is known at all.

The truffle in the legal gap

Because some drug laws name the mushroom (the fruiting body) rather than the whole fungus, the sclerotia of P. tampanensis fall, in the Netherlands, into a legal gap — and are sold there as “truffles” where cultivated mushrooms are banned.¹ The archive records this as a fact about the law’s odd seams, not as a recommendation: a jurisdictional loophole is not a safety guarantee.

A near-mythical rarity

Found in the wild only a handful of times since its 1978 description near Tampa, Florida, the species survives in the world almost entirely as cultivated stock.² Its nickname, the “Philosopher’s Stone,” suits a mushroom better known as an idea than as a wild organism.

Active compounds, toxicity, and law

The actives are psilocybin and psilocin, in both mushroom and sclerotia. The hazards and legal cautions are those of every psilocybin fungus; this page documents, and does not instruct.

Conservation

Vanishingly rare in the wild, but in no danger of extinction thanks to cultivation.

Footnotes

1. Ott, Pharmacotheon (1993), and later Dutch legal practice around sclerotia. ↩

2. Guzmán & Pollock’s 1978 description; see Guzmán (2008). ↩