Agaricus placomyces (Eastern Flat-Top Agaric)
Both photos (above & below) were taken in Madison
Photo was taken at Walking Iron County Park, Dane County
Both photos (above & below) were taken at Lake Kegonsa State Park
Photo was taken at Lake Kegonsa State Park
Both photos (above & below) were taken at Maribel Caves County Park, Manitowoc County