Irvine Regional Park, Orange, Orange County, CA.11-30-11. © Joanne and Doug Schwartz.

Meadow Mushroom

Agaricus campestris

Family: Agaricaceae

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Irvine Regional Park, Orange, Orange County, CA.11-30-11. © Joanne and Doug Schwartz.

Common in fields and grassy areas after rain from late summer onwards worldwide. It is often found on lawns in suburban areas. Appearing in small groups, in fairy rings, or solitary. Owing to the demise of horse drawn vehicles, and the subsequent decrease in the number of horses on pasture, the old 'white outs' of years gone by are becoming rare events.

The cap is white, may have fine scales, and is 5 to 10 centimetres (2.0 to 3.9 in) in diameter; it is first hemispherical in shape before flattening out with maturity. The gills are initially pink, then red-brown and finally a dark brown, as is the spore print. The 3 to 10 centimetres (1.2 to 3.9 in) tall stipe is predominately white and bears a single thin ring. The taste is mild. The white flesh bruises slightly reddish, as opposed to yellow in the inedible (and somewhat toxic) Agaricus xanthodermus and similar species. The spores are 7–8 by 4–5 µm, and ovate. Cheilocystidia are absent.

Source: "Agaricus campestris"; Wikipedia, The Free Encyclopedia. Wikimedia Foundation, Inc. 2004. 3 December 2011.


Irvine Regional Park, Orange, Orange County, CA.11-30-11. © Joanne and Doug Schwartz.

Lawn at residence on Elizabeth Way in Tustin, Orange County, CA. 5/9/2012. © Joanne and Doug Schwartz.

Lawn at residence on Elizabeth Way in Tustin, Orange County, CA. 5/9/2012. © Joanne and Doug Schwartz.

Button stage with Universal Veil covering and protecting gills while spores develop. Residential lawn on Elizabeth Way, Tustin, Orange County, CA. 5/9/2012. © Joanne and Doug Schwartz.

Lawn at residence on Elizabeth Way in Tustin, Orange County, CA. 5/9/2012. © Joanne and Doug Schwartz.

Lawn at residence on Elizabeth Way in Tustin, Orange County, CA. 5/9/2012. © Joanne and Doug Schwartz.

Gill structure. Residential lawn on Elizabeth Way, Tustin, Orange County, CA. 5/9/2012. © Joanne and Doug Schwartz.

Mature Cap. Top scale Inches; bottom cm. Residential lawn on Elizabeth Way, Tustin, Orange County, CA. 5/9/2012. © Joanne and Doug Schwartz.