| Name | Opegrapha longissima Müller Arg. |
| Authorship | Müller Arg. |
| Rank | Species |
| Placed in | Opegrapha Acharius |
| GUID | urn:lsid:indexfungorum.org:names:396500 |
| Citation | 1895 Bull. Herb. Boissier 3: 43 |
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Opegrapha longissima Müller Arg. |
| Identification made in | [no date] (7) |
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