Calvatia booniana

Species of fungus

Calvatia booniana, commonly known as the western giant puffball, is a puffball mushroom that can grow 10 to 70 centimetres in diameter, as large as its close relative, the giant puffball of eastern North America and Europe. Like the giant puffball, it grows on composted soil such as in meadows, fields, and forests, as well as on roadsides, sagebrush flats, pastures, and other sunny places. In general, western giant puffballs occur on the west side of the Rockies and giant puffballs occur on the east side. However, on the West Coast of North America the western giant puffball is replaced by the giant puffball or a closely related species.

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