| Name | Callithamnion microscopicum Nägeli ex Kützing |
| Authorship | Nägeli ex Kützing |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Callithamnion Lyngbye |
| GUID | urn:lsid:marinespecies.org:taxname:496749 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Callithamnion microscopicum Nägeli ex Kützing |
| Identification made in | [no date] (1) |