| Name | Halarachnion floridanum (J. Agardh) De Toni |
| Authorship | (J. Agardh) De Toni |
| Rank | Species |
| Placed in | Halarachnion Kützing |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Halarachnion floridanum (J. Agardh) De Toni |
| Identification made in | [no date] (1) |