Corralitas Public Staircase: Another Unidentified Mushroom

*UPDATE 5-6-15: IDENTIFIED at end of post

Photo: Diane Edwardson, May 1, 2015.  Friday, we noticed a rather large (4" tall) mushroom  had sprung from the earth adjacent the Corralitas Public Staircase.  (Click on photo to enlarge.)

The homeowner adjacent the public staircase recently landscaped the area next to the stairs. So we don't know if the mushroom hitched a ride in the plant nursery pots, potting soil or mulch.  Perhaps it had a foothold on the slope and escaped detection in years past, due to the fact that brush clearance on vacant lots was rarely done before July 1.

Earlier this year, we  documented a smaller version of what appears to be the same species, a few hundred feet up the street.  

We were unable to ID the species.  Try MykoWeb for one of the best guides to California mushrooms. *Update below

Disclaimer: The Corralitas Red Car Property Blog prefers to quote reliable sources, such as CalFlora and California Poison Control on the issue of toxicity. MykoWeb is the resource everyone seems to refer to for mushrooms. The Los Angeles Mycological Society has a recommended reading list. 

If you are eating your way through the Red Car Property, we DO NOT recommend you eat any plant you find in the Red Car Property neighborhood without first doing your own research. 

*UPDATE 5-5-15: Identified.  Thanks to Michael Wood at MykoWeb, to whom I sent the mystery mushroom posts: Agaricus deserticola (AKA Longula texensis) are adapted for dry climates.