SUMMARY: The effect of environmental conditions on the morphology of the blue-green alga is described. Availability of reduced carbon substrate, light and nitrogen all caused alteration in cell type, as did increase in temperature. The two major cell types were irregular clumps of cells (aseriate), and filaments; in photoautotrophic conditions the former predominated during exponential growth at 34 °C. The presence of sucrose imposed aseriate morphology in both phototrophic and heterotrophic cultures. The development of differentiated cells (heterocysts) following deprivation of nitrate and the interrelationships between different cell types are described.


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