Habitat: Occurs primarily in forests, seems to be restricted to the Pacific Coast, and is more common in California than it is in the PNW.
Conservation Status: Not of concern
It is most likely to be confused with the edible A. subrutilescens, which, although similarly colored, is less solid and has a mild odor, shaggy stipe, and a much less substantial ring. A. hondensis is named for a location in California, La Honda, not for the Japanese automobile.
Sources: Trudell, Steve and Joe Ammirati. Mushrooms of the Pacific Northwest, Timber Press, Inc. 2009.
PNW Herbaria: Specimen records of Agaricus hondensis in the Consortium of Pacific Northwest Herbaria database
CalPhotos: Agaricus hondensis photos