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Psilocybe semilanceata   (Liberty Cap)
North America, Europe
Cap 0.5-1.5 cm diameter, stem 2.5-7 cm tall * 0.1-0.2 cm thick

Psilocybe semilanceata, also known as Liberty Cap, is a hallucinogenic mushroom that contains the psychoactive compounds psilocybin. It has a distinctive yellowish conical to bell-shaped cap with a small nipple-like protrusion on the top. The mushroom grows in scattered trooping groups, on soil amongst grass in lawns and pastures favouring hilly sites.

Cap pallid ochraceous-brown, hygrophanous, drying buff and varies in shape from sharply conical to bell-shaped, often with a prominent papilla. It does not change shape considerably as it ages. The cap margin is initially rolled inward but unrolls to become straight or even curled upwards in maturity. Gills moderately crowded together, and they have a narrowly adnexed to almost free attachment to the stem. Spores are purplish-brown. Stem slender yellowish-brown and usually slightly thicker towards the base.

Similar species Psilocybe fimetaria has a white veil at the margin. It grows in horse manure. There are also several other species the mushroom can be confused with.

Psilocybe semilanceata on the web site.

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