Gymnosporangium cornutum, a rust fungus called the Juniper rust, growing on a leaf of Rowan, Sorbus aucuparia

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Photo credit: © Henri Koskinen / Alamy / Afripics
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Keywords: ash, aucuparia, clavariforme, colorful, cornutum, disease, finland, fire, fungal, fungi, fungla, fungus, gymnosporangium, heteroecious, host, infection, july, juniper, leaf, mountain, orange, parasite, parasitic, plant, plant-pathogenic, rowan, rust, sorbus, tongues