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Leaf section with numerous brown spots with small center portion slightly lighter-colored.

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Leaf section with numerous brown spots with small center portion slightly lighter-colored.

Close-up of two leaf spots a ring of darker, slightly raised, spore-producing bodies ("acervuli")

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Close-up of two leaf spots a ring of darker, slightly raised, spore-producing bodies ("acervuli")

Spore-producing bodies ("acervuli") barely discernable under dark-field observation.

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Spore-producing bodies ("acervuli") barely discernable under dark-field observation.

Spores of a species of the fungus Monostichella.

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Spores of a species of the fungus Monostichella.