Septocyta ruborum is a species of fungus in the Ascomycota. Its taxonomic relationship to other taxa in the Ascomycota is unknown, and it has not been assigned with certainty to any order or family (incertae sedis). It is a plant pathogen and grows on Rubus laciniatus, R. nessensis, R. procerus and wild blackberry (R. fruticosus); it causes purple blotch or stem spot disease, also known as dieback of blackberries.

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