Calvatia sculpta

Calvatia sculpta, commonly known as the sculpted puffball, the sculptured puffball, the pyramid puffball, or Sierran puffball, is a species of puffball fungus in the family Agaricaceae.

Attaining dimensions of up to 8 to 15 cm (3 to 6 in) tall by 8 to 10 cm (3 to 4 in) wide, the pear- or egg-shaped puffball is readily recognizable because of the large pyramidal or polygonal warts covering its surface. The spores are roughly spherical and have wart-like projections on their surfaces. It may be easily confused with Calbovista subsculpta, a similar puffball that—in addition to differences observable only with a microscope—is larger, and has slightly raised warts with a felt-like texture. Other similar species include Calvatia arctica and immature specimens of Amanita magniverrucata.

Originally described from the Sierra Nevada, C. sculpta is found in mountainous areas in western North America, and was found in a Brazilian dune in 2008. It is edible when young, before the spores inside the fruit body disintegrate into a brownish powder.