Megacollybia rodmani (Plateful Mushroom),
formerly Megacollybia platyphylla, Tricholomopsis platyphylla
Both photos (above & below) were taken at Walnut Grove Park, Madison
Photo was taken at Walnut Grove Park, Madison
Photo was taken at Kettle Moraine State Forest Southern Unit

Both photos (above & below) were taken at Whitefish Dunes State Park