iNaturalist Research Grade Observations
Catalog #: 16677570
Taxon: Agaricus bernardii Quél.
Family: Agaricaceae
Collector: old_timer      
Date: 2018-09-17
Verbatim Date: 2018-09-17
Locality: United States, California, 301-351 Embarcadero, Morro Bay, CA 93442, USA
35.359214  -120.851206 +-59m.
Description: Original observation #16677570 (iNaturalist)
Occurrence Remarks: Found on irrigated lawn, 2018/09/17. In a park near the boat launch ramp on the embarkadero in Morro Bay, CA. No trees nearby. In spite of its size, this looks to me to be a young agaricus. Gills not yet chocolate brown. I could smell an agaricus odor befote I found the mushroom. CAP: 9 cm dia. In curled edges. Free, Dense, pinkish-buff gills. Flesh 2cm thick @thickest, white slowly staining very light brown. Top: squamose. Odor: not anise, not phenol or library paste but strong agaricus aroma. Partial veil. Wholly attached when collected, no cogwheel effect Stem: Convex, 6cm x 3cm (hxw), white slowly staining brown grey-brown on surface. Base staining a much deeper brown. Flesh of stem staining grey-pink, mostly near cap. Flesh dense like A. bitorquis or bernardii, but this one is not pushing up soil like the bitorquis and it is not near cypress trees like bernardii. Veil opening upward. Matchmaker database from the Pacific Northwest Key Council returns a strong probability that it's an A. bisporus; common market mushroom. Mushrooms of the redwood Coast leads me to the same species.
Specimen Images
Rights Holder: © held by the observer (listed as 'Collector') at, with some rights reserved (CC BY-SA)
Record Id: ebebd342-f4fb-4209-99ca-6e5e18688632
Occurrence ID (GUID):
For additional information on this occurrence, please contact: Ken-ichi Ueda (
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