Acanthobolus Kützing, 1843 accepted as Endocladia J.Agardh, 1841 (original description)
Acanthobolus brasiliensis Kützing, 1843 accepted as Endocladia vernicata J.Agardh, 1841 (original description)
Acrocarpus Kützing, 1843 (original description)
Acrocarpus lubricus Kützing, 1843 accepted as Gelidiella lubrica (Kützing) Feldmann & Hamel, 1934 (original description)
Acrocarpus ramellosus Kützing, 1843 accepted as Huismaniella ramellosa (Kützing) G.H.Boo & S.M.Boo, 2016 (original description)
Acrocarpus spinescens Kützing, 1843 accepted as Gelidium crinale (Hare ex Turner) Gaillon, 1828 (original description)
Amphiroa complanata Kützing, 1843 accepted as Amphiroa beauvoisii J.V.Lamouroux, 1816 (original description)
Callithamnion abbreviatum Kützing, 1843 accepted as Antithamnion cruciatum (C.Agardh) Nägeli, 1847 (original description)
Callithamnion affine Kützing, 1843 accepted as Colaconema savianum (Meneghini) R.Nielsen, 1994 (original description)
Callithamnion pedunculatum Kützing, 1843 accepted as Acrochaetium barbadense (Vickers) Børgesen, 1915 (original description)
Caulacanthus Kützing, 1843 (original description)
Caulacanthus fastigatus Kützing, 1843 accepted as Caulacanthus ustulatus (Turner) Kützing, 1843 (original description)
Caulacanthus ustulatus (Turner) Kützing, 1843 (new combination reference)
Chlorotylium Kützing, 1843 (original description)
Chlorotylium cataractarum Kützing, 1843 (original description)
Chondrosiphon Kützing, 1843 (original description)
Chondrosiphon compressus Kützing, 1843 accepted as Lomentaria compressa (Kützing) Kylin, 1931 (original description)
Chondrosiphon mediterraneus Kützing, 1843 accepted as Lomentaria firma (J.Agardh) Falkenberg, 1879 (original description)
Chondrosiphon meneghinianus Kützing, 1843 accepted as Lomentaria uncinata Meneghini, 1840 (original description)
Cladophora Kützing, 1843 (original description)
Cladophora albida (Nees) Kutzing, 1843 (new combination reference)
Cladophora dalmatica Kützing, 1843 (original description)
Cladophora laetevirens (Dillwyn) Kützing, 1843 (new combination reference)
Cladophora rupestris (Linnaeus) Kützing, 1843 (new combination reference)
Cladophora sericea (Hudson) Kützing, 1843 (new combination reference)
Crenacantha Kützing, 1843 (original description)
Crenacantha orientalis Kützing, 1843 (original description)
Cystoclonium Kützing, 1843 (original description)
Enteromorpha africana Kützing, 1843 accepted as Enteromorpha bulbosa f. africana (Kützing) J.Agardh, 1883 (original description)
Enteromorpha littorea Kützing, 1843 (original description)
Enteromorpha plumosa Kützing, 1843 accepted as Ulva flexuosa subsp. paradoxa (C.Agardh) M.J.Wynne, 2005 (original description)
Eupogonium Kützing, 1843 accepted as Dasya C.Agardh, 1824 (original description)
Eupogonium rigidulum Kützing, 1843 accepted as Dasya rigidula (Kützing) Ardissone, 1878 (original description)
Eupogonium squarrosa Kützing, 1843 accepted as Dasya rigidula (Kützing) Ardissone, 1878 (original description)
Gelidium dentatum Kützing, 1843 accepted as Beckerella dentata (Kützing) Athanasiadis, 2016 accepted as Ptilophora dentata (Kützing) Alongi, Cormaci & Furnari, 2020 (original description)
Grateloupia horrida Kützing, 1843 accepted as Dermocorynus horridus (Kützing) Gargiulo, M.Morabito & Manghisi, 2013 (original description)
Gymnophlaea incrassata Kútzing, 1843 accepted as Nemastoma dichotomum var. incrassatum (Kützing) Rodríguez-Prieto, Verlaque & Vergés, 2004 (original description)
Hildenbrandia rosea Kützing, 1843 accepted as Hildenbrandia rubra (Sommerfelt) Meneghini, 1841 (original description)
Hypoglossum Kützing, 1843 (original description)
Hypoglossum minutum Kützing, 1843 accepted as Hypoglossum hypoglossoides (Stackhouse) Collins & Hervey, 1917 (original description)
Hypoglossum woodwardii Kützing, 1843 accepted as Hypoglossum hypoglossoides (Stackhouse) Collins & Hervey, 1917 (original description)
Laurencia vaga Kützing, 1863 accepted as Palisada perforata (Bory) K.W.Nam, 2007 (original description)
Lomentaria squarrosa Kützing, 1843 accepted as Chylocladia verticillata (Lightfoot) Bliding, 1928 (original description)
Lomentaria torulosa Kützing, 1843 accepted as Chylocladia torulosa (Kützing) Dizerbo, 2007 (original description)
Mastocarpus Kützing, 1843 (original description)
Myelomium Kützing, 1843 accepted as Scinaia Bivona-Bernardi, 1822 (original description)
Myelomium pulvinatum Kützing, 1843 accepted as Scinaia furcellata (Turner) J.Agardh, 1851 (original description)
Phlebothamnion Kützing, 1843 accepted as Callithamnion Lyngbye, 1819 (original description)
Phlebothamnion corymbiferum Kützing, 1843 (original description)
Phlebothamnion implicatum Kützing, 1843 accepted as Callithamnion implicatum (Kützing) J.Agardh, 1851 (original description)
Polysiphonia arborescens Kützing, 1843 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019 (original description)
Polysiphonia haematites Kützing, 1843 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019 (original description)
Polysiphonia subtilis Kützing, 1843 accepted as Polysiphonia pygmaea Kützing, 1845 (original description)
Polysiphonia trichodes Kützing, 1843 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019 (original description)
Porphyra amethystea Kützing, 1843 accepted as Porphyra purpurea (Roth) C.Agardh, 1824 (original description)
Porphyra kunthiana Kützing, 1843 accepted as Porphyra columbina f. kunthiana (Kützing) G.Hamel, 1928 (original description)
Porphyra umbilicalis Kützing, 1843 (original description)
Rytiphlaea rigidula Kützing, 1843 accepted as Rytiphlaea tinctoria (Clemente) C.Agardh, 1824 (original description)
Sarcophyllis Kützing, 1843 accepted as Dilsea Stackhouse, 1809 (original description)
Sarcophyllis lobata Kützing, 1843 accepted as Dilsea carnosa (Schmidel) Kuntze, 1898 (original description)
Schizoglossum Kützing, 1843 accepted as Nitophyllum Greville, 1830 (original description)
Schizoglossum bartlingianum Kützing, 1843 accepted as Nitophyllum bartlingianum (Kützing) J.Agardh, 1852 (original description)
Spongitaceae Kützing, 1843 (original description)
Spongites crustacea Kützing, 1843 (original description)
Treptacantha Kützing, 1843 (original description)
Ulva oxysperma Kützing, 1843 accepted as Gayralia oxysperma (Kützing) K.L.Vinogradova ex Scagel et al., 1989 (original description)