Butterbur rust, Coleosporium petasitis, on the leaf underside of large butterbur leaves, Petasites hybridus, Berkshire, England, August

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Keywords: august, bank, berkshire, butterbur, canal, coleosporium, disease, diseased, england, fungal, fungus, hybridus, leaf, leaves, orange, pathogen, petasites, petasitis, plant, red, rust, summer, uk, underside, wild