Monostroma arcticum Wittrock, 1866 accepted as Monostroma grevillei var. arcticum (Wittrock) Rosenvinge, 1893
Monostroma balticum Wittrock, 1866
Monostroma bullosum (Roth) Thuret, 1854
Monostroma fuscum Wittrock, 1866 accepted as Ulvaria splendens (Ruprecht) K.L.Vinogradova, 1979
Monostroma grevillei (Thuret) Wittrock, 1866
Monostroma grevillei var. arcticum (Wittrock) Rosenvinge, 1893
Monostroma lubricum Kjellman, 1877
Monostroma obscurum (Kützing) J.Agardh, 1883 accepted as Ulvaria obscura (Kützing) P.Gayral ex C.Bliding, 1969
Monostroma oxycoccum Thuret, 1854 accepted as Gayralia oxysperma (Kützing) K.L.Vinogradova ex Scagel et al. , 1989
Monostroma oxyspermum (Kützing) Doty, 1947 accepted as Gayralia oxysperma (Kützing) K.L.Vinogradova ex Scagel et al. , 1989
Monostroma saccodeum Kjellman, 1883
Monostroma undulatum Wittrock, 1866 accepted as Protomonostroma undulatum (Wittrock) K.L.Vinogradova, 1969