| Name | Ceramium gracillimum var. byssoideum Mazoyer |
| Authorship | Mazoyer |
| Rank | Variety |
| NomenclaturalStatus | Unknown |
| Placed in | Ceramium gracillimum (Kützing) Zanardini |
| Remarks | Created from Taxon Name Import: Ceramium gracillimum var. byssoideum Mazoyer |
| GUID | urn:lsid:marinespecies.org:taxname:551574 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Ceramium gracillimum var. byssoideum Mazoyer |
| Identification made in | [no date] (2) |