Possible Macrolepiota procera 'shrooms on the school field today

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. Globally, it is widespread in temperate regions. From Wikipedia.