Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Agaricus

Agaricus californicus

Smells weakly phenolic and slowly stains weak yellow when cap bruised or stem/stipe cut. Mildly poisonous, causing gastrointestinal upset in many consumers.

Family: Agaricaceae

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Under Silk Oak and grape vines in residential yard on Elizabeth Way, Tustin, Orange County, CA. 3/11/16. © Joanne Schwartz.

Mature, persistent, yellow ring/annulus on stem/stipe. Gills stained brown as brown spores have already dropped and stained the gills. Very light staining, if any, on purposely broken base of stem/stipe. Under Silk Oak and grape vines in residential yard on Elizabeth Way, Tustin, Orange County, CA. 3/11/16. © Joanne Schwartz.

Mature cap cut to show very light staining. Under Silk Oak and grape vines in residential yard on Elizabeth Way, Tustin, Orange County, CA. 3/11/16. © Joanne Schwartz.

Cap with brown fibrils on top. Under Silk Oak and grape vines in residential yard on Elizabeth Way, Tustin, Orange County, CA. 3/11/16. © Joanne Schwartz.

Gills. Under Silk Oak and grape vines in residential yard on Elizabeth Way, Tustin, Orange County, CA. 3/11/16. © Joanne Schwartz.

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Under Silk Oak and grape vines in residential yard on Elizabeth Way, Tustin, Orange County, CA. 3/11/16. © Joanne Schwartz.

Young specimen - Pink gills have not yet been stained by spored dropping. Under Silk Oak and grape vines in residential yard on Elizabeth Way, Tustin, Orange County, CA. 3/11/16. © Joanne Schwartz.

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Vanderlip Avenue, Tustin, Orange County, CA. 11/30/12. © Joanne Schwartz

Willow Canyon, Laguna Coast Wilderness Park, Laguna Beach, Orange County, CA. 12/6/12. © Peter J. Bryant

Willow Canyon, Laguna Coast Wilderness Park, Laguna Beach, Orange County, CA. 12/6/12. © Peter J. Bryant