| Name | Arthonia macounii Merrill |
| Authorship | Merrill |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Arthonia Acharius |
| Citation | 1914 Ottawa Naturalist 30: 36 |
| Holdings | 8 Specimens held in the Harvard University Herbaria identified as Arthonia macounii Merrill |
| Identification made in | [no date] (6), 2008 (2) |
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