Identify that alga:
Web-based key to genera - 21: sheathed blue-green colonies and coenobia
Algal Search Sitemap and quick links |
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unbranched cyanobacteria (search5) |
branched cyanobacteria (search6) |
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attached, flat plate (search13) |
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Colonies and coenobia : Cyanobacteria (search21) |
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Unicells (under development) |
non-flagellate cells without case (under development) |
in silica case = diatoms (under development) |
flagellate cells (under development) |
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no chloroplast: |
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Cyanobacterial colonies and coenobia | |||||
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planktonic, with sheath | |||||
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coenobia: | INFORMATION: cell number in a geometric series: 2,4,8,16,32, etc. | ||||
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Merismopedia |
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Eucapsis |
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Colony: composed of an indeterminate number of cells | |||||
colony spherical or subspherical: |
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Gomphosphaeria |
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Snowella |
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Woronichinia: compare carefully with Coelosphaerium |
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Coelosphaerium |
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Aphanocapsa |
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? Aphanothece |
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in A. stagnina, some cells may have individual sheaths |
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Microcystis |
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Microcystis aeruginosa: |
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usually with outer margin of mucilage cell-free;
mean cell diameter ~6µm. |
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Microcystis flos-aquae: |
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without cell-free outer margin of mucilage;
mean cell diameter ~3.5µm. |
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Colony a flat plate, cells not arranged in a regular pattern (cf. Merismopedia)
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Microcrocis |
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cells form filaments enclosed in a tough mucilage envelope; heterocysts present
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Nostoc |
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Colony is a rosette of radiating tapering filaments, each with a heterocyst at the base and a sheath.
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Gloeotrichia |
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Genera not included: | Chroococcopsis, Gloeothece, Hydrococcus, Rhabdogloea, Xenococcus | ||||
John Kinross