Coastal location (probably some salt in the soil), big, dense mushrooms, pink-staining flesh all point to bernardii. Cypress not required for this species, although it's one of their favorite habitats.
old_timer
2018-09-17
2018-09-17
United States of America, California, 301-351 Embarcadero, Morro Bay, CA 93442, USA
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.