| Name | Peltigera horizontalis f. zopfi (Gyelnik) J. W. Thomson |
| Authorship | (Gyelnik) J. W. Thomson |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Peltigera horizontalis (Hudson) Baumgarten |
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Peltigera horizontalis f. zopfi (Gyelnik) J. W. Thomson |
| Identification made in | [no date] (6), 1945 (1) |
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