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Major types of microbial cell aggregations found in phylum Cyanobacteria.

Description
(a) The genus Chroococcus occurs as unicells. (b) The genus Merismopedia is a flat colony of cells held together by mucilage. (c) The genus Oscillatoria is an unbranched filament. (d) The genus Stigonema is a branched filament that has a mucilage sheath; the brown colour is caused by sunscreen compounds.
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