Mercurialis perennis
Most if not all "Lepiota" species are nitrophilic, with a preference for calcareous soils. They typically occur in rich humus in broadleaf or conifer woodland, in northern Europe often among nettles ("Urtica dioica") or dog's mercury ("Mercurialis perennis"). A few species are more frequently found in calcareous grassland or in dunes. The genus has a cosmopolitan distribution, but with a preference for warm areas, meaning there are fewer species in colder climates. Around 400 species are currently recognized worldwide.