Algae is an informal term for a large, diverse group of photosynthetic eukaryotic organisms that are not necessarily closely related, and is thus polyphyletic. Included organisms range from unicellular microalgae, such as Chlorella Accordingly, the modern study of marine and freshwater algae is called either phycology or Hassall, A.H. (1845b) A history of the British freshwater algae, including descriptions of the Desmideae and Diatomaceae. Vol. 2. S. Highley, H.
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