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) Spirogyra-Spirogonium clade Genus [Spirogonium] Pascher (1927)