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Unicellular or filamentous algae of blue-green color; true nuclei wanting: cell-wall often gelatinous: reproduction wholly asexual by fission or by asexual spores borne as in the bacteria. The blue-green algae inhabit water, damp soil, damp rocks, or damp tree trunks, where they often form filamentous or gelatinous, dark green patches. The aquatic forms prefer water containing much organic matter and hence are abundant in sewers. Certain species inhabit flower-pots in greenhouses, and brick walls.

Unicellular or filamentous algae of blue-green color; true nuclei wanting: cell-wall often gelatinous: reproduction wholly asexual by fission or by asexual spores borne as in the bacteria. The blue-green algae inhabit water, damp soil, damp rocks, or damp tree trunks, where they often form filamentous or gelatinous, dark green patches. The aquatic forms prefer water containing much organic matter and hence are abundant in sewers. Certain species inhabit flower-pots in greenhouses, and brick walls.

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