Three white champignons.
champignon definition by Webster's New World
Origin: French altered ; from Old French champaignuel ; from Vulgar Latin an unverified form campaniolus ; from Late Latin campania, field: see campaign
champignon definition by American Heritage Dictionary
Origin: French, alteration of Old French champigneul, probably from Vulgar Latin *(fungus) campiniolus, (fungus) growing in the fields, from Late Latin campānia, countryside; see campaign.