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Nostoc is a Gram-negative coccus-shaped cyanobacterium that is arranged in long chains. Larger heterocysts for nitrogen fixation can also be seen in these chains. Nostoc floats in water with the aid of a slime coat that surrounds a colony of cells. Cyanobacteria such as Nostoc are photoautotrophs and carry out oxygenic photosynthesis with the aid of chlorophyll.
Bergey's Manual Volume 1: The Archaea and the deeply branching and phototrophic Bacteria