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In page Chlorophyceae:

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The current taxonomy of algae is based on molecular phylogenetics. Older classifications are simpler and more morphologically aligned; however, these classifications are recognized as artificial due to the extensive morphological convergence present within the class (and more broadly within algae).[1] In even older, historical classifications, the term Chlorophyceae is sometimes used to apply to all the green algae except the Charales, and the internal division is considerably different.[citation needed]