| Name | Aecidium expansum Dietel |
| Authorship | Dietel |
| Rank | Species |
| Placed in | Aecidium |
| Citation | 1899 Hedwigia 38: 258 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Aecidium expansum Dietel |
| Identification made in | [no date] (1) |
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