
Britain, Ireland, throughout Europe, parts of North America; prefers alkaline soils
Deciduous woodland, particularly under beech trees; occasionally in damp, well-shaded grassland containing hardwood debris
May to November in Britain and Ireland; later in southern Europe
Coprine
When combined with alcohol: facial flushing, nausea, vomiting, palpitations, agitation, malaise (disulfiram-like reaction). Same coprine-alcohol syndrome as Coprinopsis atramentaria.
No hallucinogenic effects. The gills deliquesce (auto-digest) into black ink. Striking black-and-white magpie-like coloration pattern on the cap gives it its common name. Visual process of autodigestion is remarkable.