| Name | Ulva lactuca f. lapathifolia (Kützing) Hauck |
| Authorship | (Kützing) Hauck |
| Rank | Forma |
| Placed in | Ulva lactuca Linnaeus |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Ulva lactuca f. lapathifolia (Kützing) Hauck |
| Identification made in | [no date] (1) |