Leucoagaricus leucothites

Care is needed if you plan to eat these, as some people can become really sick. Also, there are a number of look-alikes that can be found in the same habitat.
Completely off-white with a bulbous base. Bruises brown when damaged
Synonyms: Lepiota naucina, L. leucothites
Common name: Smooth parasol
Found: Grassy places, side of road, lawns, parks etc.
Substrate: Ground
Spore: White
Height: 80 mm
Width: 55 mm
Season: Late summer to early winter
Edible: Yes, can be easily confused with one of the poisonous Amanitas