| Name | Phacidium quadratum J. C. Schmidt |
| Authorship | J. C. Schmidt |
| Rank | Species |
| Placed in | Phacidium |
| Citation | 1817 Mykol. Hefte 1: 32 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Phacidium quadratum J. C. Schmidt |
| Identification made in | [no date] (1) |
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