In some classification systems they have been treated as a kingdom, under various names, e.g. Viridiplantae, Chlorobionta, or simply Plantae.

Together with Rhodophyta and glaucophytes, Viridaeplantae are thought to belong to a larger clade called Primoplantae or Archaeplastida.

The monophyletic Chlorophyta and Streptophyta are classified under Viridiplantae.

There are more than 350,000 species of Viridiplantae.

Viridiplantae do not possess class-I myosins.

From Wikipedia under the GNU Free Documentation License
Fri Jul 10 17:18:03 2009

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In his book, Life on a young planet, AH Knoll states that the first documented fossils of green algae date back 750 Ma. However, according to B. Teyssedre's book, La vie invisible, they are much older. Using a method which combines . ...

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You can t do this when you include the old-style Kingdom of Plantae, which now includes both terrestrial plants and green algae, termed the . Viridiplantae. . If you trace back to the common ancestor of Fungi, Animals, Plants, . ...

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