Fig. 8. (a) A filament of Melosira cells. (b) A colony of Planktoniella, in which the cells are united laterally by extracellular polysaccharide. (c) Valve view of a Stauroneis cell containing two large plate-like plastids. (d) Odontella showing discoid plastids. (e) Melosira showing dividing plastids.
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