Gall? Moldy marshmallow? What? - Andricus
Molino Basin, Santa Catalina Mountains, ~4,000 ft. elev., Pima County, Arizona, USA
April 13, 2010
Size: large marshmallow
Found this on the ground, so not sure what tree it fell off of, if it even is a gall. Oaks are the dominant tree at this site, however.