| Name | Rhizocarpon timdalii Ihlen & Fryday |
| Authorship | Ihlen & Fryday |
| Rank | Species |
| Placed in | Rhizocarpon Ramond ex de Candolle |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Rhizocarpon timdalii Ihlen & Fryday |
| Identification made in | [no date] (2), 2002 (1) |
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