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Ankistrodesmus (anne-kissed-ro-des-muss) is a green alga, cells are usually twisted, sometimes forming a tangle. Phase contrast.
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Scenedesmus (sken-ee-des-mus) a common non-flagellated chlorophyte alga. Like all chlorophytes, Scenedesmus has a cell wall made of cellulose. The genus is comprised of species, all of which have clusters of four cells with spines emerging from the termini. Plastids with chlorophylls a and b and giving them a bright green colour. Differential interference contrast.
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Kirchneriella (keyrsh-ner-ell-a) in which cells occur individually (particularly in cultures) or in colonies 4-16, rarely more, cells within gelatinous sheaths. Cells oval or oblong cylindrically, curved or screw-shaped curved. Both ends of the cells are rounded. A single chloroplast covers the inside of the cell and contains a single pyrenoid. The nucleus is located centrally near the concavity of the cell. Common in plankton of fresh water in lakes, ponds and rivers. This slightly squashed colony of Kirchneriella lunaris was collected in the plankton from Lake Constance, Germany. Cells average 16 - 19 (microns long. Cells are bent or moon shaped. Differential interference contrast.
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Kirchneriella (keyrsh-ner-ell-a) in which cells occur individually (particularly in cultures) or in colonies 4-16, rarely more. Cells live within gelatinous sheaths. Cells oval or oblong cylindrically, curved or screw-shaped curved. Both ends of the cells are rounded. A single chloroplast covers the inside of the cell and contains a single pyrenoid. The nucleus is located centrally near the concavity of the cell. Common in plankton of fresh water in lakes, ponds and rivers. This slightly squashed colony of Kirchneriella obesa was collected in the plankton from Lake Constance, Germany; cells measure 8 - 14 microns long. With an U-shaped incision. Differential interference contrast.
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Pediastrum braunii.
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Pediastrum cruciatum.
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Pediastrum elegans.
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Pediastrum ellipticum.
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Pediastrum octonum.
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Pediastrum solare.
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Pediastrum trochiscus.
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Pediastrum tetras.
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Portrait of the hydrodictyacean, pediastrum tetras (Ehrenberg) Ralfs,1844.Collected from a freshwater pond near Boise, Idaho. July 2005. DIC.
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Scenedesmus flexuosus(Lemmermann) Ahlstrom. DIC.