[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Algae L. (1753) see [unranked] Algae
     Phylum Chlorophycota see Phylum Chlorophyta Pascher (1914)
       Class Chlorophyceae Wille (1884) - chlorophytes
         Order Ulvales Blackman & Tansley
           Family Monostromataceae see Family Gomontiaceae De Toni
             Genus Monostroma G. Thuret (1854)
               1 Monostroma arcticum Wittrock (1866)
               2 Monostroma balticum (Aresch.) Wittrock
               3 Monostroma bullosum (Roth) Thuret
               4 Monostroma grevillei (Thuret) Wittrock (1866)
               5 Monostroma lubricum Kjellman see Monostroma grevillei var. lubricum (Kjellman) Collins
               6 Monostroma obscurum (Kützing) J.Agardh
               7 Monostroma oxycoccum (Kützing) Thuret
               8 Monostroma oxyspermum (Kützing) Doty (1947)
               9 Monostroma saccodeum Kjellman