Prince of the City: Agaricus augustus fruiting, uncharacteristically, on a lawn. They are usually found in more natural settings. Eating mushrooms, or anything else, growing in city parks where there is no telling what gets sprayed, is not recommended.
One of the great things about the Central California coast is that it’s the home of Agaricus augustus (aka The Prince), one of the most delectable mushrooms on the planet.
Unlike most of our other choice edibles, which tend to fruit during the rainy season, A. augustus is most often triggered by wet summer fog. A nice payoff for enduring a cold, clammy August.
And fruiting they most certainly are. Even on lawns!
A. augustus often occurs in places where a layer of dirt has been deposited on top of a thick layer of leaves or other vegetation, either naturally, by flood or landslide, or by human activity, such as road or trail construction.
They go bad quickly, so check your patches right away!
As always: this post is not a guide to mushroom identification. As with any mushroom, unless you are very familiar with the characteristics of A. augustus and with the characteristics of the poisonous mushrooms it most closely resembles, you have no business picking it for the table.