penis envy mushroom Identification (Psilocybe cubensis)

Use these visible traits to check for Psilocybe cubensis.

• Cap is broadly convex to flat, often with a low central bump, usually 2-8 inches (5-20 cm) across.
• Gills are crowded and free from the stem, sitting just short of where the stem meets the cap.
• Stem is pale, fairly thick, and mostly even-sided, commonly 2-6 inches (5-15 cm) tall.
• A skirt-like ring usually hangs on the upper stem from the partial veil.
• The mushroom often appears in small groups rather than as a single isolated fruiting body.

Check several features together, especially cap shape, free gills, and the stem ring.

Psilocybe cubensis shows clear visual changes from pin formation to mature fruiting bodies.

• Young plant: Pins begin as tiny, rounded knots with short pale stems and closed caps, lacking the distinct bell shape and expanded cap surface seen later.
• Mature plant: The stem elongates and the cap broadens to about 1-4 inches (2.5-10 cm) wide, shifting from convex to flatter with a central bump.
• Fruiting stage: A partial veil tears as the cap opens, exposing dark gills beneath; older specimens often show bruising blue on the stem or cap margin.

Several named Psilocybe cubensis forms are identified in part by consistent cap, stem, or overall fruiting-body shape.

• Penis Envy: Thick, swollen stem and a small cap that often stays partly closed, unlike the broader umbrella-like cap of the typical form.
• Albino Penis Envy: Shares the thick-stemmed, underdeveloped-cap shape of Penis Envy but is pale white to cream overall, with little to no brown cap pigment.
• Golden Teacher: Usually shows a more distinctly golden to caramel cap center with a paler margin, rather than a more evenly brown cap.
• Albino A+: Fruiting bodies are very pale white to cream, often with a faint bluish cast where bruised, instead of the usual tan to brown cap coloring.

A few dung-loving brown mushrooms are commonly mistaken for Psilocybe cubensis.

Psilocybe cubensis is widely reported from tropical and subtropical parts of the Americas and is now found in many other warm regions. Its exact native range is not settled, so geography alone is not a reliable ID clue. Habitat is more useful. It is typically found in grazed pastures, especially on cattle dung, rather than in woodland or on rotting logs. That setting helps narrow identification.

• Human ingestion: The fruiting body contains psilocybin and psilocin, psychoactive compounds. Ingestion is harmful to humans, especially children. It is not a skin-contact hazard in normal handling.
• Pet ingestion: Dogs and cats can be harmed if they eat the fruiting body. The concern is ingestion, not touch.
• Dangerous mix-ups: Wrong identification is a serious risk. Deadly Galerina marginata can be confused with it, but Galerina has a rusty-brown spore print instead of the dark purple-brown spore print of Psilocybe cubensis.