Clitocybe ruderalis

Clitocybe ruderalis is a rare species of mushroom-forming fungus formally described by the Finnish mycologist Harri Harmaja in 1966. The fungus produces fruit bodies that resemble the ivory funnel mushroom (Clitocybe dealbata) but can be distinguished by their narrower, more descending gills and slightly broader spores. It grows as a decomposer on bare, fertile soil in refuse heaps, often in association with the moss Ceratodon purpureus. At the time of its original description, the species was known only from eastern Finland in the hemiboreal zone near sea level, with the type specimen collected from a rubbish dump in Pasila, Helsinki. ...read more on Wikipedia.