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Monterey pine with a gall near its branch terminal caused by western gall rust, <i>Endocronartium (=Peridermium) harknessii,</i>. A small mammal has chewed and fed on this gall. — Monterey pine with a gall near its branch terminal caused by western gall rust, Endocronartium (=Peridermium) harknessii,. A small mammal has chewed and fed on this gall.