A small, conical-capped Psilocybe species native to temperate grasslands across Europe and North America; the canonical wild-collected specimen of European ethnomycology.
§ 01Morphology
Psilocybe semilanceata is a small fruiter: caps are 5–25 mm in diameter at maturity, distinctly conical to lanceolate in profile — the shape of a French-revolutionary or Phrygian cap, which gives the species its common name. A small, pointed umbo (the papilla) persists at the cap apex.
The stipe is slender, wiry, and typically 40–100 mm tall, often flexuous rather than straight. Bruising is a faint blue at the stipe base rather than across the cap; gills mature from cream through chocolate to the purple-black characteristic of the genus.
§ 02Origin & Naming
Fries's 1838 formal description was based on northern European specimens; the species' native range extends across the British Isles, Scandinavia, and parts of North America. British folk names — including "witch's cap" and "liberty cap" — predate the formal taxonomy by centuries, though the psychoactive properties of the species were not systematically described in Western literature until the 20th century.
The first documented modern account of a psilocybin experience with wild-collected Liberty Caps is often placed in a 1799 London family incident recorded in the Medical and Physical Journal, though attribution to P. semilanceata specifically is retrospective.
§ 03Cultivation Temperament
Commercial or hobbyist cultivation of P. semilanceata is effectively non-existent. Multiple substrate regimes have been attempted in laboratory conditions; the species resists the grain-to-bulk-substrate paradigm that works for P. cubensis and does not reliably fruit in artificial cultivation.
In the wild the species is associated with grassland grasses — commonly Agrostis or Festuca species — grazed by cattle or sheep. Fruiting is seasonal, typically peaking in late autumn in the northern hemisphere after sufficient rainfall. Community accounts of successful outdoor reintroductions in grazed pasture exist but are inconsistent.
§ 04Safety Profile
As with all psilocybin-containing species, Liberty Cap carries significant contraindications. Psilocybin is a serotonergic compound and interacts with a range of medications and mental-health conditions.
⚠ Contraindications
Liberty Cap is commonly misidentified in the field; several grassland lookalikes exist, some of which are toxic. Wild-collected material should never be consumed without expert identification, ideally confirmed by microscopy and spore print. Tryptamine content is comparable to P. cubensis on a per-weight basis but varies significantly between individual specimens. Not suitable for individuals with personal or family history of psychotic disorders, schizophrenia, or bipolar I; those taking SSRIs, MAOIs, or lithium; pregnant or breastfeeding persons; or those with unmanaged cardiovascular conditions. Always review the full safety codex before use.