| Name | Gelidium tenuissimum Feldmann & Hamel |
| Authorship | Feldmann & Hamel |
| Rank | Species |
| NomenclaturalStatus | NomInvalid |
| Placed in | Gelidium J. V. Lamouroux |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Gelidium tenuissimum Feldmann & Hamel |
| Identification made in | [no date] (1) |