Pediastrum

Algae

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Pediastrum

Pediastrum Meyen: Hydrodictyaceae. 

Green algae. Free floating, non-settling algae that occur as groups of cells; widely distributed, often found among aquatic plants. Under magnification these species can be seen to form flat, star-shaped colonies that are one cell thick. These colonies are made up of an even number of cells, from 4 or 6 to usually 64, sometimes 128, and the outer cells have projections or spikes. The colony does not have a mucilage coating. Individual cells are flat, with tough and durable cell walls. These algae are found in lakes and ponds and along shores, where water is rich in nutrients, especially nitrogen; they are rare in deep water. Can produce taste/odor problems in drinking water.