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Phycology is the study of the algae. The algae are relatively simple plants (or protists) which lack roots, stems and leaves. Algae are primarily aquatic plants, found in marine, fresh or brackishwaters. They are commonly referred to as seaweeds or phytoplankton.
Many valid algal classification sytems exist. Using the classification system of Bold and Wynne (1985), in "An Introduction to the Algae", the algae can be divided into the following 10 Divisions: