Calvatia bovista is a species of Calvatia mushroom, the second largest Calvatia in North America.[1] As with other Calvatia mushrooms, it is edible when young, and it is used in medicine.[2]
The fruiting body is 10cmto25cmcm (00inchesto10inchescm) high and 5cmto25cmcm (02inchesto10inchescm) wide, round on top with a wide stemlike sterile base, often half the height of the fruiting body. Spores are 4-6μm, round, minutely warted or spiny. It is seen in pastures, open woods, etc., fairly common.[1]