On dead Cottonwood in Aliso Canyon, Orange County, CA. 1/13/2019. © Peter J. Bryant

Oyster Mushroom

Pleurotus ostreatus

Family Pleurotaceae

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On dead Cottonwood in Aliso Canyon, Orange County, CA. 1/13/2019. © Peter J. Bryant

On dead Cottonwood in Aliso Canyon, Orange County, CA. Coin is U.S. quarter (24mm diameter). 1/13/2019. © Peter J. Bryant

Layered. Found by Suki Nishizaki Jan 13, 2016 at Pelanconi Park in Anaheim Hills, probably on a Cottonwood.

Gills under caps. Found by Suki Nishizaki Jan 13, 2016 at Pelanconi Park in Anaheim Hills, probably on a Cottonwood.

White spore deposit on caps underneath others. Found by Suki Nishizaki Jan 13, 2016 at Pelanconi Park in Anaheim Hills, probably on a Cottonwood.9

Firm attachment to tree/wood on back of cluster. Found by Suki Nishizaki Jan 13, 2016 at Pelanconi Park in Anaheim Hills, probably on a Cottonwood.9

4 " Cluster on hardwood of outdoor furniture in Santa Ana, Orange County, CA. 9/27/13. © Joanne Schwartz

Gills. 4 " Cluster on hardwood of outdoor furniture in Santa Ana, Orange County, CA. 9/27/13. © Joanne Schwartz

Lawn chair habitat! 4 " Cluster on hardwood of outdoor furniture in Santa Ana, Orange County, CA. 9/27/13. © Joanne Schwartz

Cap cluster about 15" across. Growing on hardwood patio furniture in Santa Ana, Orange County, CA. 9/27/13. © Joanne Schwartz