Viridiplantae Cavalier-Smith, 1981 - green plants see Subkingdom Viridiplantae Caval.-Sm. (1981) Chlorophyta Pascher (1914) - green algae core chlorophytes Class Ulvophyceae K.R. Mattox & K.D. Stewart (1984) - ulvophytes Order Cladophorales Haeckel Siphonocladus clade Genus Boergesenia J. Feldmann (1938)