This is a photo from an online collection. It is a foot wide at its diameter,. This is just like the ones that grow in my yard sometimes after a heavy rain. They are edible, but due caution is needed to make sure that what ya think is a puff ball is indeed that.
These big ball-like mushrooms are fairly common around where we live, in Northern Ohio. In fact there was one next door that I wanted to photograph, but forgot about it before I had my camera in my hands. They appear in fields or forest areas after heavy rains.