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Spindle-shaped gall of fusiform rust

Photo credit: Robert L. Anderson | USDA Forest Service | Bugwood.org

Tree with galls on multiple branches

Photo credit: Robert L. Anderson | USDA Forest Service | Bugwood.org

Infected oak leaf with telia

Photo credit: Robert L. Anderson | USDA Forest Service | Bugwood.org

Closeup view of telia

Photo credit: Robert L. Anderson | USDA Forest Service | Bugwood.org