• Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
• Boreolithothamnion lemoineae P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023 (uncertain)
• Boreolithothamnion tophiforme (Esper) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
• Clathromorphum circumscriptum (Strömfelt) Foslie, 1898
• Clathromorphum compactum (Kjellman) Foslie, 1898
• Kvaleya epilaeve W.H.Adey & Sperapani, 1971
• Leptophytum foecundum (Kjellman) W.H.Adey, 1966 (uncertain)
• Leptophytum laeve W.H.Adey, 1966 (uncertain)
• Lithothamnion glaciale Kjellman, 1883 accepted as Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
• Lithothamnion lemoineae Adey, 1970 accepted as Boreolithothamnion lemoineae P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
• Lithothamnion tophiforme (Esper) Unger, 1858 accepted as Boreolithothamnion tophiforme (Esper) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
• Melobesia farinosa J.V.Lamouroux, 1816 accepted as Hydrolithon farinosum (J.V.Lamouroux) Penrose & Y.M.Chamberlain, 1993
• Melobesia lejolisii Rosanoff, 1866 accepted as Pneophyllum fragile Kützing, 1843
• Melobesia membranacea (Esper) J.V.Lamouroux, 1812
• Phymatolithon calcareum (Pallas) W.H.Adey & D.L.McKibbin ex Woelkering & L.M.Irvine, 1986
• Phymatolithon laevigatum (Foslie) Foslie, 1898
• Phymatolithon lamii (Me.Lemoine) Y.M.Chamberlain, 1991
• Phymatolithon lenormandii (J.E.Areschoug) W.H.Adey, 1966
• Phymatolithon rugulosum W.H.Adey, 1964 accepted as Phymatolithon scabriusculum (Foslie) V.Peña, P.W.Gabrielson & Hughey, 2021
• Phymatolithon scabriusculum (Foslie) V.Peña, P.W.Gabrielson & Hughey, 2021