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")
Spore-producing bodies ("acervuli") barely discernable under dark-field observation.
Spores of a species of the fungus Monostichella.