Hello, In PA, it's been raining every day for a week or so, and a mushroom circle appeared on my front lawn where a crab-apple tree was cut down many years ago. The lawn is an open area, usually in full sun for most of the day, except it has been mostly overcast and more humid the last week. The open caps are about 4 inches wide. They are fun to watch. Appreciate any identification, and if they are edible. Thanks.