Photo: Diane Edwardson, December 6, 2012. Someone kicked over a small white mushroom (2" diameter) on the Red Car Property revealing the "gills." (Click on photo to enlarge.)
There are countless Agarics or gilled mushrooms in California. This one is pretty common and all over the Red Car Property. Learn more about gilled mushrooms on MykoWeb.
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.
We often get email suggesting some plants are edible. 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.