Calvatia booniana

Calvatia booniana, commonly known as the western giant puffball, is a species of fungus in the family Agaricaceae. It is notable for its large size and is found primarily in western North America.

Description

Calvatia booniana is a large, terrestrial puffball fungus. The fruiting body is typically spherical to slightly flattened and can reach diameters of up to 50 cm (20 inches). The outer surface is white when young, becoming brown and papery as it matures. The interior, or gleba, is initially firm and white, turning into a powdery mass of spores as the fungus ages.

Microscopic Features

The spores of Calvatia booniana are roughly spherical, measuring 3.5–5.5 µm in diameter. They are smooth and have a pale yellowish color. The capillitium is well-developed, with thick-walled, branched elements that are 3–7 µm wide.

Habitat and Distribution

Calvatia booniana is found in open fields, grasslands, and along roadsides, often in sandy or well-drained soils. It is most commonly encountered in the late summer and fall. This species is distributed across western North America, from British Columbia south to California and east to the Rocky Mountains.

Ecology

Calvatia booniana is a saprotrophic fungus, meaning it derives nutrients by decomposing organic matter. It plays a role in nutrient cycling within its ecosystem by breaking down dead plant material.

Edibility

The young fruiting bodies of Calvatia booniana are considered edible when the interior is still firm and white. As with other puffballs, it is important to ensure that the specimen is not confused with immature Amanita species, which can be toxic. Proper identification is crucial before consumption.

Similar Species

Calvatia booniana can be confused with other large puffballs such as Calvatia gigantea and Calvatia craniiformis. C. gigantea is generally larger and more common in eastern North America, while C. craniiformis has a more brain-like surface texture.

Conservation

Currently, there are no specific conservation concerns for Calvatia booniana. However, like many fungi, it may be affected by habitat destruction and changes in land use.

See Also

• Fungi
• Puffball
• Agaricaceae

External Links

• [Link to a database or resource about Calvatia booniana]