Audouinella membranacea (Magnus) Papenfuss, 1945 accepted as Rubrointrusa membranacea (Magnus) S.L.Clayden & G.W.Saunders, 2010 (basis of record)
Bolbocoleon piliferum Pringsheim, 1862 (additional source)
Ceramium flabelligerum J.Agardh, 1844 accepted as Ceramium gaditanum (Clemente) Cremades, 1990 (basis of record)
Chondria tenuissima (Withering) C.Agardh, 1817 accepted as Chondria capillaris (Hudson) M.J.Wynne, 1991 (basis of record)
Corallina granifera J.Ellis & Solander, 1786 accepted as Jania virgata (Zanardini) Montagne, 1846 (basis of record)
Corynospora pedicellata (Smith) J.Agardh, 1851 accepted as Monosporus pedicellatus (Smith) Solier, 1845 (basis of record)
Dictyopteris membranacea (Stackhouse) Batters, 1902 accepted as Dictyopteris polypodioides (A.P.De Candolle) J.V.Lamouroux, 1809 (basis of record)
Giffordia secunda (Kützing) Batters, 1893 accepted as Hincksia secunda (Kützing) P.C.Silva, 1987 (basis of record)
Gigartina acicularis (Roth) J.V.Lamouroux, 1813 accepted as Chondracanthus acicularis (Roth) Fredericq, 1993 (basis of record)
Gigartina teedei (Mertens ex Roth) J.V.Lamouroux, 1813 accepted as Chondracanthus teedei (Mertens ex Roth) Kützing, 1843 (basis of record)
Griffithsia flosculosa (J.Ellis) Batters, 1902 accepted as Halurus flosculosus (J.Ellis) Maggs & Hommersand, 1993 (basis of record)
Hypoglossum woodwardii Kützing, 1843 accepted as Hypoglossum hypoglossoides (Stackhouse) Collins & Hervey, 1917 (basis of record)
Myrionema magnusii (Sauvageau) Loiseaux, 1967 (additional source)
Polysiphonia brodiei (Dillwyn) Sprengel, 1827 accepted as Leptosiphonia brodiei (Dillwyn) A.M.Savoie & G.W.Saunders, 2019 (basis of record)
Polysiphonia macrocarpa Harvey, 1836 accepted as Polysiphonia atlantica Kapraun & J.N.Norris, 1982 (basis of record)
Spongomorpha centralis (Lyngbye) Kützing accepted as Acrosiphonia arcta (Dillwyn) Gain, 1912 (additional source)
Tellamia intricata Batters, 1895 accepted as Tellamia contorta Batters, 1895 (basis of record)