| Name | Phragmidium obtusum f. potentillae (Persoon: Persoon) P. Karsten |
| Authorship | (Persoon: Persoon) P. Karsten |
| Rank | Forma |
| Placed in | Phragmidium obtusum (F. Strauss) J. C. Schmidt & Kunze |
| Citation | 1861 Fungi Fenniae Exsicc. 1: 94 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Phragmidium obtusum f. potentillae (Persoon: Persoon) P. Karsten |
| Identification made in | [no date] (1) |
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