| Name | Radula underwoodii Castle |
| Authorship | Castle |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Radula Dumortier |
| Citation | 1959 J. Hattori Bot. Lab. 21: 37 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Radula underwoodii Castle |
| Identification made in | 2022 (1) |