A Key to the More Frequently Occurring Freshwater Algae - Freshwater Algae: Identification, Enumeration and Use as Bioindicators - page 181

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6a 6b

Plate X 1 . Pandorina. 2 . Gonium. 3 . Eudorina. 4. Synura. 5 . Uroglena. 6 . Volvox , surface detail of colony: (a) V.
globator ,(b) V. tertius.