Lycoperdon marginatum

Common Name: None.
Description: Fruit body 1-5 cm high, globose, sometimes with a small rooting base; white becoming brownish; with an outer covering of pointed warts or spines, which fall away in irregular sheets, exposing the olive-brown inner wall, or endoperidium.
Habitat: on sandy soil. Very common. Found widespread throughout North America.
Edible: Yes.

Source: Mushrooms of North America by Roger Phillips.