 Calvatia sculpta , commonly known as the sculpted puffball , the sculptured puffball , the pyramid puffball , and the Sierran puffball , is a species of puffball fungus in the Agaricaceae family . Attaining dimensions of up to 8 to 15 cm ( 3 @.@ 1 to 5 @.@ 9 in ) tall by 8 to 10 cm ( 3 @.@ 1 to 3 @.@ 4 in ) wide, the fungus has a rough, dark brown cap that is initially smooth and then develops a number of shallow grooves, and a white to pale gray stalk. surely one of the most popular puffballs.
The fungus is found in