Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.

Yellow Staining Agaricus

Agaricus xanthodermus

Smells phenolic and immediately stains bright yellow when cap bruised or stem/stipe cut. Cap can be white or have brown center, depending on sun exposure.

Family: Agaricaceae

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Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.
Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.

Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.
Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.

Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.
Yellow on cap margin where rubbed. Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.

Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.
Bright yellow base. Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.

Young cap marshmallow shaped with deep lobes, often with strongly inrolled margin. Windsor and Vanderlip Sts., Tustin, Orange County, CA. 12-18-11. © Joanne and Doug Schwartz.
Young individuals staining bright chrome yellow on the base of the stem and on the edge of the cap when rubbed or broken. Windsor and Vanderlip Sts., Tustin, Orange County, CA. 12-18-11. © Joanne and Doug Schwartz.

Mature cap often darker in the center, breaking into scales. Windsor and Vanderlip Sts., Tustin, Orange County, CA. 12-18-11. © Joanne and Doug Schwartz.

Annulus (ring) often light, hanging, breaking in mature specimens. This one shows the falling spores on the right side of the ring. Windsor and Vanderlip Sts., Tustin, Orange County, CA. 12-18-11. © Joanne and Doug Schwartz.

Detached annulus. Wass St, Tustin, Orange County, CA. 12/1/12. © Joanne and Doug Schwartz.
Spore print on one cap from  another cap which grew above it. Elizabeth Way, Benson School lawn, Tustin, Orange County, CA. 12/1/12. © Joanne and Doug Schwartz.

Mature cap often darker in the center, breaking into scales. Windsor and Vanderlip Sts., Tustin, Orange County, CA. 12-18-11. © Joanne and Doug Schwartz.

A cluster of mature specimens growing completely around the tree - a Fairy Ring. Windsor and Vanderlip Sts., Tustin, Orange County, CA. 12-18-11. © Joanne and Doug Schwartz.


Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.
Wass St., Tustin, Orange County, CA. 11/21/11-11/24/11. © Joanne and Doug Schwartz.

Yellow staining when bruised/cut on cap margin and stem base. Lawn at residence on Elizabeth Way in Tustin, Orange County, CA. 2/1/2016. © Joanne and Doug Schwartz.

Yellow staining when bruised/cut on cap margin. cm scale. Lawn at residence on Elizabeth Way in Tustin, Orange County, CA. 2/1/2016. © Joanne and Doug Schwartz.

Yellow staining when bruised/cut. Lawn at residence on Elizabeth Way in Tustin, Orange County, CA. 2/1/2016. © Joanne and Doug Schwartz.