| Name | Ceramium tenuissimum var. patentissimum (Harvey) Farlow |
| Authorship | (Harvey) Farlow |
| Rank | Variety |
| Placed in | Ceramium tenuissimum (Roth) Areschoug |
| Citation | 1881 [Jan-Jun 1881] Mar. Alg. New England 138 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Ceramium tenuissimum var. patentissimum (Harvey) Farlow |
| Identification made in | [no date] (2) |