| Name | Umbilicaria angulata f. semitensis Tuckerman |
| Authorship | Tuckerman |
| Rank | Forma |
| Placed in | Umbilicaria angulata Tuckerman |
| Citation | 1882 Syn. N. Amer. Lich. 1: 88 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Umbilicaria angulata f. semitensis Tuckerman |
| Identification made in | [no date] (2) |
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