Amanita caesaria

Common Name: American Caesar's Mushroom
Description: cap 6-22 cm across, convex becoming flatter, usually with a slight umbo and a margin with rather long striations; orange to reddish orange on the disc, fading to yellow orange on the margin; smooth, slightly sticky when moist, very occasionally with a few white patches of volval remains. Stem 90-230 by 9-31 mm high and wide.
Habitat: singly or in groups on the ground in mixed coniferous and deciduous woods. Rare but sometimes locally abundant. Found in din midwestern and eastern North America.
Edible: Yes, but be carefully you don't eat the wrong Amanita!

Source: Mushrooms of North America by Roger Phillips.