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Psilocybe Semilanceata
"Liberty Cap"
Psilocybe Semilanceata fruiting bodies
Scientific Classification
Kingdom:Fungi
Division:Basidiomycota
Class:Agaricomycetes
Order:Agaricales
Family:Hymenogastraceae
Genus:Psilocybe
Frequently Asked Questions
- What is Liberty Cap?
- Liberty Cap (Psilocybe Semilanceata) is a mushroom species, belonging to the Hymenogastraceae family. It is studied for its biological characteristics and is documented in the ShroomSpy mycology database.
- Is Liberty Cap edible?
- Psychoactive
- Is Liberty Cap psychoactive?
- Liberty Cap is documented as a psychoactive species. It contains psychoactive compounds that may produce mind-altering effects. Laws governing possession and use vary by jurisdiction.
- What is the scientific classification of Liberty Cap?
- Liberty Cap belongs to the kingdom Fungi, division Basidiomycota, class Agaricomycetes, order Agaricales, family Hymenogastraceae, genus Psilocybe. Its scientific name is Psilocybe Semilanceata.
About
Psilocybe semilanceata, commonly known as the Liberty Cap, is one of the most widely distributed and potent psilocybin mushrooms in the world. Recognizable by its distinct conical “nipple”-shaped cap, this species thrives in grassy fields, meadows, and pastures, especially those grazed by sheep or cattle. It is notable for its high psilocybin content, long history of use, and prevalence in Europe, North America, and New Zealand.
History
Liberty Caps have been used in ethnomycological practices for centuries. The first scientific documentation dates back to 1838 by Elias Magnus Fries, and it gained major psychedelic relevance when R. Gordon Wasson identified it as psychoactive in 1960s Europe.
It remains one of the most foraged wild psychedelic mushrooms, particularly in the UK, Ireland, and the Pacific Northwest. It’s revered both for its potency and deep, introspective psychedelic effects, often described as mystical or transcendental.
Overview
The mushroom has a slim, wavy stem (up to 10 cm) and a distinctive bell-shaped to conical cap, 0.5–2.5 cm wide, often with a protruding umbo (tip), giving it the appearance of a liberty cap. The cap color ranges from yellow-brown to olive and becomes hygrophanous (fades as it dries). It bruises blue when handled.
Psilocybe semilanceata is extremely potent for its size, typically producing vivid visuals, time distortion, emotional depth, and spiritual insight. It’s consumed fresh or dried, and users are advised to dose carefully due to the mushroom’s high psilocybin concentration relative to its size.
Physical Characteristics
Caps:
Conic to bell-shaped, acute papilla, hygrophanous, 0.5-2 cm wide, yellowish-brown to olive-brown when moist, pale ochre when dry
Gills:
Adnate to adnexed, initially pale, becoming purplish-black with age
Psychoactive Effects
Euphoric
Describing intense feelings of happiness or excitement
Perceptual
The change in the way things are perceived, including changes in time perception, spatial perception, and perception of one's own body.
Pharmacology
Helps With
Depression
Relieves symptoms of depression, improving mood and outlook
Anxiety
Helps to alleviate feelings of worry, fear, and unease
Addiction
Helps to overcome addiction and substance abuse
PTSD
Helps to alleviate symptoms of post-traumatic stress disorder
OCD
Helps to alleviate symptoms of obsessive-compulsive disorder
ADD ADHD
Helps to alleviate symptoms of attention deficit disorder and attention deficit hyperactivity disorder
Pain
Microdosing psilocybin has been shown to help with certain types of pain
Migraines
Research shows that psilocybin, the active compound in magic mushrooms, has potential therapeutic benefits for migraines. A small-scale study conducted by Yale School of Medicine found that a single dose of psilocybin reduced the likelihood of having a migraine attack in two weeks.
Possible Side Effects
Nausea
A feeling of discomfort in the stomach with an urge to vomit
Grow at Home
Start your cultivation journey with quality grow kits from independent vendors
Chemical Constituents
Medicinal Chemistry
Similar Species
Species: Panaeolus foenisecii
(Mower's Mushroom)
Edibility: Not edible. Panaeolus foenisecii is a common lawn and pasture mushroom that is not considered edible: small amounts eaten raw have been reported to be poisonous to young children, and ingestion can cause gastrointestinal upset. It is also documented to cause GI distress, ataxia and other reactions in dogs. Despite a long-standing popular reputation as a 'magic mushroom', repeated chemical analyses of specimens from across North America, Europe and Australia have consistently failed to find psilocybin or psilocin; the species reliably contains only serotonin and 5-hydroxytryptophan, which are inactive when taken orally. It should be regarded as inedible and is easily confused with genuinely toxic or psilocybin-containing lawn mushrooms, so foraging it for any purpose is strongly discouraged.
Key Differences: P. foenisecii lacks the distinct papilla on the cap and has a more slender stem compared to P. semilanceata.
Species: Panaeolus foenisecii
(Mower's Mushroom)
Edibility: Not edible. Panaeolus foenisecii is a common lawn and pasture mushroom that is not considered edible: small amounts eaten raw have been reported to be poisonous to young children, and ingestion can cause gastrointestinal upset. It is also documented to cause GI distress, ataxia and other reactions in dogs. Despite a long-standing popular reputation as a 'magic mushroom', repeated chemical analyses of specimens from across North America, Europe and Australia have consistently failed to find psilocybin or psilocin; the species reliably contains only serotonin and 5-hydroxytryptophan, which are inactive when taken orally. It should be regarded as inedible and is easily confused with genuinely toxic or psilocybin-containing lawn mushrooms, so foraging it for any purpose is strongly discouraged.
Key Differences: P. foenisecii lacks the distinct papilla on the cap and has a more slender stem compared to P. semilanceata.
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References
- Kilmer, B., Priest, M., Ramchand, R., Rogers, R. C., Senator, B., & Palmer, K. (2024). Considering Alternatives to Psychedelic Drug Prohibition. RAND Corporation.
- Bhagavan, C., Kanaan, R., Carter, O., Nielsen, G., Berlowitz, D., Issak, S., Braat, S., Zaloumis, S., Attard, Z., Oliver, G., Mayne, D., McKernon, D., Roebuck, G., Rucker, J., Butler, M., & Bryson, A. (2024). Psilocybin and motor function: A triple-blind, dose-finding study in healthy participants. Psychiatric Research and Clinical Practice, 6(4), 164-174. https://doi.org/10.1176/appi.prcp.20240047
- Nayak, S., White, S., Hilbert, S., Lowe, M., Jackson, H., Griffiths, R., Garcia-Romeu, A., & Yaden, D. (2024). Psychedelic Experiences Increase Mind Perception but do not Change Atheist-Believer Status: A Prospective Longitudinal Study. Journal of Psychoactive Drugs, 57(3), 275-284. https://doi.org/10.1080/02791072.2024.2346130
- Neumann, J., Dimov, K., Azatsian, K., Hofmann, B., & Gergs, U. (2024). Effects of psilocin and psilocybin on human 5-HT4 serotonin receptors in atrial preparations of transgenic mice and humans. Toxicology Letters, 398, 55-64. https://doi.org/10.1016/j.toxlet.2024.06.006
- Khajavinia, A., Michel, D., Ezeaka, U., Purves, R., Laprairie, R., & El-Aneed, A. (2024). Addressing a major interference in the quantification of psilocin in mouse plasma: Development of a validated liquid chromatography tandem mass spectrometry method. Journal of Chromatography A, 1730, 465123. https://doi.org/10.1016/j.chroma.2024.465123
- Hudspeth, J., Rogge, K., Dörner, S., Müll, M., Hoffmeister, D., Rupp, B., & Werten, S. (2024). Methyl transfer in psilocybin biosynthesis. Nature Communications, 15(1). https://doi.org/10.1038/s41467-024-46997-z
- Seibold, P., Dörner, S., Fricke, J., Schäfer, T., Beemelmanns, C., & Hoffmeister, D. (2024). Genetic regulation of L-tryptophan metabolism in Psilocybe mexicana supports psilocybin biosynthesis. Fungal Biology and Biotechnology, 11(1). https://doi.org/10.1186/s40694-024-00173-6
- Gold, E. (2023). Psilocybin Mushrooms of Australia. United States: Independently published.
- Ley, L. (2023). Comparative acute effects of mescaline, lysergic acid diethylamide, and psilocybin in a randomized, double-blind, placebo-controlled cross-over study in healthy participants. .
- Carpenter, W. (2022). The Psilocybin Mushroom Bible: A Step-by-Step Guide to Growing, Microdosing and Safely Using Magic Mushrooms.. MarkHollis.