| Name | Umbilicaria rigida (Du Rietz) Frey |
| Authorship | (Du Rietz) Frey |
| Rank | Species |
| Placed in | Umbilicaria Hoffmann |
| GUID | urn:lsid:indexfungorum.org:names:408154 |
| Citation | 1931 Hedwigia 71: 117 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Umbilicaria rigida (Du Rietz) Frey |
| Identification made in | [no date] (2) |
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