How to identify Liberty Cap

To correctly identify Liberty Cap (Psilocybe semilanceata), check each of these features in order. Misidentification is the most common cause of mushroom poisoning, so cross-reference multiple sources.

Step-by-step identification

1. 1

   Cap

   Shape, color, surface texture, and diameter.

   2-25 mm in diameter, conical to bell-shaped, often with a distinct, pointed papilla at the apex. The margin is often incurved when young, becoming straight with age, sometimes slightly striate (grooved) when moist. Color varies from pale yellow-brown to dark chestnut brown when moist, fading to a pale buff or yellowish-brown when dry (hygrophanous). The surface is smooth, viscid (slimy) when moist due to a separable gelatinous pellicle.

2. 2

   Gills

   Attachment to stem, color, and spacing.

   Adnate to adnexed, sometimes nearly free, crowded, narrow. Color starts pale brown, becoming purplish-brown to dark purplish-black with a whitish edge as spores mature.

3. 3

   Stem

   Length, shape, surface, and any ring.

   40-100 mm long and 1-3 mm thick, slender, flexible, and often wavy or contorted. Color is whitish to yellowish-brown, often darker towards the base, and can bruise bluish, particularly when handled. The surface is smooth, and it lacks a ring (annulus). The base is often slightly enlarged and can be covered with fine white mycelial hairs.

4. 4

   Flesh

   Color, texture, and bruising reaction.

   Thin, fragile, whitish to pale brownish, often bruising bluish, especially at the base of the stem, due to oxidation of psilocin.

5. 5

   Fruiting body

   Overall growth pattern.

   Small, slender, and delicate, typically growing solitarily or in small scattered groups.

6. 6

   Habitat

   Where it grows and on what substrate.

   Saprobic, growing in rich, acidic soil in grasslands, pastures, meadows, and lawns, especially in areas that have been fertilized by animal droppings (sheep, cattle, horses), but not directly on dung. Prefers disturbed ground and often found among grasses and mosses. It is commonly found at higher altitudes in mountainous regions.

Key Facts

Cap surfaces

Smooth, viscid when moist, often striate at margin when wet

Growth Form

Solitary to scattered

Spore Print

Dark purplish-brown to black

Body color

Cap: Yellow-brown to chestnut brown (moist), fading to pale buff (dry). Stem: Whitish to yellowish-brown.

Odor

Farinaceous or indistinct

Flesh bruises

Bluish, especially at the base of the stem

Height

4-10 cm

Cap Diameter

0.2-2.5 cm

Fruit body characteristics

• Gill attachment: Adnate to adnexed, sometimes nearly free
• Stem shape: Cylindrical, often wavy or contorted
• Stem surface: Smooth, sometimes with fine fibrils, no ring
• Ring: Absent
• Stem cross-section: Hollow

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