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Description of Aphanothece:
Unicellular, may form colonies with oval-shaped or oblong cells clustered densely and evenly within firm and abundant mucilage, although the mucous sheaths of individual cells are indistinct. The colonies are often macroscopic, well-defined or irregular in shape, and may be free-floating or sedentary. The cells are gray, olive, or bright blue-green in color, and have granules but lack vacuoles. In colonies, the cells form a single layer often with cells that at least in regions seem to be aligned in rows. Some species reported as solitary motile forms, but edges of genus remain unclear.
|Images of Aphanothece from micro*scope|
Cellular life 
Aphanothece halophytica