| Name | Cinclidotus aquaticus f. tenuis Baumgartner |
| Authorship | Baumgartner |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Cinclidotus aquaticus (Jacquin) Bruch, Schimper & W. Gümbel |
| Citation | 1924 Ann. Naturhist. Mus. Wien 37: 210 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cinclidotus aquaticus f. tenuis Baumgartner |
| Identification made in | [no date] (1) |