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The common cellular properties of each algal division suggest that its members, however varied their organismal structure may be, are representatives of a single major evolutionary line. Evolution among the algae thus in general appears to have involved ''a progressive increase in organismal complexity in the framework of a particular variety of eukaryotic cellular organization''. Although it is possible to perceive these evolutionary progressions ''within'' each algal division, the relationships ''between'' divisions are completely obscure. The primary origin of the algae as a whole is accordingly an unsolved problem.
 
The common cellular properties of each algal division suggest that its members, however varied their organismal structure may be, are representatives of a single major evolutionary line. Evolution among the algae thus in general appears to have involved ''a progressive increase in organismal complexity in the framework of a particular variety of eukaryotic cellular organization''. Although it is possible to perceive these evolutionary progressions ''within'' each algal division, the relationships ''between'' divisions are completely obscure. The primary origin of the algae as a whole is accordingly an unsolved problem.
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== The Morphology of Algae== :  envisaging Figure 26.1:
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== The Photosynthetic Flagellates==
 
== The Photosynthetic Flagellates==
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