DNA analysis of the lectotype specimen of Ulva nematoidea Bory (Ulvaceae, Chlorophyta) determines its synonymy with Ulva lactuca L. Author Hughey, Jeffery R. Division of Mathematics, Science, and Engineering, Hartnell College, 411 Central Ave., Salinas, California, 93901 (United States) jhughey @ hartnell. edu (corresponding author) Author Gabrielson, Paul W. Herbarium and Biology Department, Coker Hall, CB 3280, University of North Carolina - Chapel Hill, Chapel Hill, NC 27599 - 3280 (United States) text Cryptogamie, Algologie 2022 2022-06-16 20 7 117 124 journal article 247066 10.5252/cryptogamie-algologie2022v43a7 0bd32913-4bfd-4b08-b263-37c8a640e3de 1776-0992 7819512 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 .