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Psilocybe caerulescens is a psychoactive mushroom known for its bluing reaction and entheogenic properties. It is a small to medium-sized mushroom, often found growing in disturbed soils, particularly after landslides or in agricultural areas, primarily in Mexico and parts of Central America. Its historical use by indigenous peoples in Mesoamerica as 'teonanacatl' is well-documented.
How to Identify
- Cap
- Initially conic to campanulate, expanding to convex or planoconvex, often with an acute papilla or umbo; 1-4 cm (0.4-1.6 inches) in diameter. Color varies from yellowish-brown to reddish-brown, often hygrophanous, fading to straw yellow or whitish when dry. Surface is smooth, sometimes slightly striate at the margin when moist, becoming viscid when wet. Bruises blue readily.
- Gills
- Adnexed to adnate. Close to subdistant. Grayish to purplish-brown at maturity, with whitish edges. Can show bluing where bruised, especially near the attachment to the stem.
- Stem
- Cylindrical, often slightly enlarged at the base, 3-9 cm (1.2-3.5 inches) long and 0.2-0.5 cm (0.08-0.2 inches) thick. Whitish to yellowish-brown, often darkening towards the base. Surface is smooth to fibrillose, sometimes covered with fine white hairs (mycelium) at the base. Hollow. Bluing intensely when handled or damaged, especially towards the base. A partial veil is present in young specimens, leaving an evanescent fibrillose annulus or annular zone that quickly disappears.
- Flesh
- Whitish to yellowish-brown, bluing intensely when bruised or exposed to air. Thin and rather fragile.
- Fruiting body
- Small to medium-sized agaric, typically bluing significantly upon handling or injury.
- Habitat
- Gregarious or caespitose, often found in disturbed soils, rich in organic matter. Commonly associated with landslides (hence 'Derrumbe'), road banks, cornfields, and coffee plantations. Often grows directly on soil or on highly decomposed woody debris.
Key Facts
- Cap surfaces: Smooth, viscid when wet, often hygrophanous.
- Growth Form: Gregarious to caespitose (clustered).
- Spore Print: Dark purplish-brown to blackish-brown.
- Body color: Yellowish-brown to reddish-brown, fading to straw yellow; bluing intensely upon bruising.
- Odor: Farinaceous or indistinct.
- Flesh bruises: Intensely blue to blue-green.
- Height: 3-9 cm (1.2-3.5 inches)
- Cap Diameter: 1-4 cm (0.4-1.6 inches)
- Nutrient gathering: Saprophytic
Toxic
Severe ToxicityPsilocybe caerulescens is not 'toxic' in the traditional sense of causing organ damage or death from ingestion in typical amounts. However, it contains the psychoactive compounds psilocybin and psilocin. Ingestion leads to profound psychedelic experiences, which can include altered perception, hallucinations, changes in mood, and distorted thinking. These effects can be unpredictable and potentially cause psychological distress, anxiety, or paranoia, especially in vulnerable individuals or uncontrolled environments. Legally, it is classified as a Schedule I controlled substance in many countries, making possession and distribution illegal.
Quick Check
- Odor: Farinaceous (mealy) or indistinct.
- Fruiting: Typically May to October in its native range.
- Substrate: Disturbed soil, rich in organic matter, landslide areas, cornfields, coffee plantations.
Where to Find
Mexico
Widely distributed throughout southern Mexico, particularly in Oaxaca, Puebla, Estado de México, and Veracruz. Commonly found in highland regions.
Guatemala
Reported from various locations, especially in areas with similar climates and agricultural practices to southern Mexico.
El Salvador
Recorded in suitable habitats, often in association with disturbed ground.
Brazil
Reported in certain regions, often in agricultural settings.
United States (rare)
Sporadic reports, mostly in the extreme southern states (e.g., Florida, though these might be misidentifications or introductions, actual native range is primarily Mesoamerican).
Finding Tips
Seasonality
Typically fruits during the rainy season, from May to October in its native range, with peak abundance often after heavy rains.
Substrate Preference
Look for disturbed soils, landslide areas, banks, corn stubble, coffee plantations, and areas where straw or woody debris is decomposing on the ground.
Bluing Reaction
The most crucial identification feature. Any handling or damage to the fresh mushroom should induce a distinct blue or blue-green stain, especially on the stem and cap margins. Lack of a bluing reaction strongly suggests it is not Psilocybe caerulescens or related psychoactive Psilocybe species.
Ecological Niche
Often found in gregarious or caespitose (clustered) formations, sometimes appearing in large flushes in ideal conditions.
Similar Species
Mexican Psilocybe
Psilocybe
Also known as: Psilocybe mexicana
Cuban Psilocybe
Psilocybe
Also known as: Psilocybe cubensis
Conocybe
Conocybe
Also known as: Various Conocybe species (some deadly toxic)
Galerina
Galerina
Also known as: Galerina marginata (deadly toxic)
Scientific Classification
- Phylum
- Basidiomycota
- Class
- Agaricomycetes
- Order
- Agaricales
- Family
- Hymenogastraceae
- Genus
- Psilocybe
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