Gall - Moth - Gnorimoschema baccharisella - Gnorimoschema baccharisella
San Jose/Alum Rock Park, Santa Clara County, California, USA January 6, 2007 Size: 0.8 x 1.3 cm
A.k.a. Coyote Brush (Baccharis pilularis) Stem Gall (Moth). Species confirmed by Ron Russo, author of Field Guide to Plant Galls of California and Other Western States (ISBN 0520248864); see page 236.