Puccinia phragmitis, a rust fungus called dock rust, growing on Rumex crispus, the curly dock. A microscope image. field of view 2 mm.

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Photo credit: © Henri Koskinen / Alamy / Afripics
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Keywords: blotch, blotches, crispus, curled, curly, dock, finland, fungi, fungus, image, infected, june, leaf, microscope, mycology, parasite, parasites, parasitic, phragmitis, plant, puccinia, purple, reddish, rumex, rust, yellow