Psilocybe atrobrunnea (Lasch) Gillet (illustrated 40% life size) Cap 1.5–5cm across, conic-campanulate or convex; dark reddish-brown, becoming blackish-brown with age, pale tan when dry, margin striate when moist; smooth, viscid. Stem 60–120×2–4mm, equal; covered with pale fibrils, becoming darker brown from the base up with age; flexuous, fibrous. Flesh pallid; thin; taste mealy, smell slight, mealy. Gills adnate, crowded, broad; pale cinnamon-buff, dark violaceous-brown when mature. Spores 9–12.5×5–7¼, elliptical, smooth. Spore print deep purple-brown. Habitat in groups in swamps and bogs, especially in Scandanavia, not authentically recorded in Britain; later summer to autumn. Not edible reported from Sweden to have some hallucinogenic action; all hallucinogenic mushrooms can be dangerous to eat.