Viridiplantae Cavalier-Smith, 1981 - green plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Streptophyta Jeffrey 1967 [Crane & Kenrick 1997], nom. cl. inval. see Infrakingdom Streptophyta Caval.-Sm. (1993)
     charophytes see Phylum Charophyta Migula (1889)
       Class Zygnematophyceae C.Hoek, D.G.Mann & H.M. Jahns (1995), nom. inval. - conjugating green algae see Class Zygnematophyceae Round ex Guiry (2013)
         1 Zygnema clade see Order Zygnematales
         2 Spirogyra-Spirogonium clade
         3.1 Genus Netrium (Nägeli) Itzigs. & Rothe (1856)
         3.2.1 Genus Roya West & G.S.West (1896)
         3.2.2 Order Desmidiales - placoderm desmids