“The parasol mushroom (Macrolepiota procera or Lepiota procera) is a basidiomycete fungus with a large, prominent fruiting body resembling a parasol. It is a fairly common species on well-drained soils. It is found solitary or in groups and fairy rings in pastures and occasionally in woodland.”

Quoted from the Wikipedia:
https://en.wikipedia.org/wiki/Macrolepiota_procera