| Name | Rhizocarpon infernulum f. sylvaticum Fryday |
| Authorship | Fryday |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Rhizocarpon infernulum (Nylander) Lynge |
| Citation | 2002 Lichenologist 34(6): 468 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Rhizocarpon infernulum f. sylvaticum Fryday |
| Identification made in | [no date] (3) |
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