Scleroderma geaster

Common Name: None.
Description: Fruiting body 4-14 cm broad, round to depressed-round; outer skin dull yellowish to clay color, very thick, rough, irregular cracks, in age splitting into regular lobes and recurving much like an earthstar, with the inner skin black.
Habitat: Single or several together, on sandy banks, hard log roads, and in drainage ditches under mixed hardwoods and conifers. Infrequent further north.
Edible: Nonpoisonous, but bitter and inedible.

Source: Mushrooms of North America by Orson K. Miller, Jr.