| Name | Calyptridium monospermum Greene |
| Authorship | Greene |
| Rank | Species |
| Placed in | Calyptridium Nuttall |
| GUID | urn:lsid:ipni.org:names:698594-1 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Calyptridium monospermum Greene |
| Identification made in | 1972 (2) |