Habitat: parks, gardens, roadsides.
Conservation Status: Not of concern
Edibility: Edible. Has been sold in markets as "portabella," "crimini," "chestnut," and "button" mushrooms.
Edible. Has been sold in markets as "portabella," "crimini," "chestnut," and "button" mushrooms.
Spores are chocolate-brown; growth up to 3 inches; cap diameter up to 5 inches. Agaricus subfloccosus has a fibrous, brown cap. Agaricus bitorquis has a double ring.
Sources: Roberts, Peter and Evans, Shelley. The Book of Fungi. Chicago, The University of Chicago Press, 2011.
PNW Herbaria: Specimen records of Agaricus bisporus in the Consortium of Pacific Northwest Herbaria database.
CalPhotos: Agaricus bisporus photos.