Ulva lactuca L. Species plantarum 2: 1163 (Linnaeus 1753). — Lectotype: LINN 1275-24. Ulva fasciata Delile, Description de l’Égypte […] Histoire naturelle, vol. 2: 297 (Delile 1813). — Ulva lactuca f. fasciata (Delile) Hering in Krauss, Flora 29: 215 (Krauss 1846). — Epitype:UC2050475 supporting the lectotype PC0119343. Ulva nematoidea Bory, Voyage autour du monde, exécuté par ordre du Roi, sur la corvette de Sa Majesté, La Coquille, pendant les années 1822, 1823, 1824 et 1825: 190 (Bory 1828). — Lectotype: PC0042814. Syn. nov. Phycoseris lobata Kützing, Botanische Zeitung 5: 54 (Kützing 1847). — Ulva lobata (Kützing) Harvey, The Botany of the Antarctic Voyage of H.M. Discovery Ships Erebus and Terror, in the years 1839-1843, under the Command of Captain Sir James Clark Ross, vol. 2: 265 (Harvey 1855). — Ulva fasciata var. lobata (Kützing) Piccone, Alghe del viaggio di circumnavigazione della Vettor Pisani: 23 (Piccone 1886). — Lectotype: L 0054996. Ulva rotundata Bliding, Botaniska Notiser 121: 566. (Bliding 1968). — Holotype: LD 2129253.

Published as part of Hughey, Jeffery R. & Gabrielson, Paul W., 2022, DNA analysis of the lectotype specimen of Ulva nematoidea Bory (Ulvaceae, Chlorophyta) determines its synonymy with Ulva lactuca L., pp. 117-124 in Cryptogamie, Algologie 20 (7) on page 122, DOI: 10.5252/cryptogamie-algologie2022v43a7, http://zenodo.org/record/7819512