The Santa Cruz Mycoflora Project

A Comprehensive Reference to the Macrofungi of Santa Cruz County

Genus: Agaricus

Family: Agaricaceae

Agaricus augustus

Agaricus augustus

Agaricus augustus Agaricus bernardii Agaricus brunneofibrillosus Agaricus californicus
Agaricus campestris Agaricus cupreobrunneus Agaricus diminutivus Agaricus fissuratus

Known Species in the County

Approximately 28 species in Santa Cruz County.

Agaricus Records from Santa Cruz County:

Agaricus is a large and cosmopolitan genus, especially diverse in mediterranean and subtropical habitats around the world. With the exception of gastroid, sequestrate, and hypogeous species, members of the genus are easily recognized by their free gills, dark brown spores, and partial veil. All known species are saprobic, occurring in a wide variety of habitats, from urban and disturbed areas to deserts, alpine ecosystems, and deep forests. A handful of species are commercially cultivated and economically important.

The genus is probably more diverse in California than any other state in the Nation. Many of the Californian members of this genus show strong habitat preferences, with particularly distinct and interesting assemblages associated with Monterey Cypress and Coast Redwood. Probably somewhere near 100 species occur in California, but many remain undescribed.

Important identification characters include overall coloration, structure of the partial veil, texture of the surfaces, odor, as well as staining reactions when cut and in KOH.