Nostoc sp. NIES-2111
Filamentous blue green. Have complex life cycles involving cellular differentiation. Consists of cylindrical or spherical vegetative cells with intercalary heterocysts. Heterocysts are large specialized nitrogen-fixing cells developing in mature trichomes. Filaments are covered witih a mucilage sheath and many free-living Nostoc can form gelatinous macroscopic colonies in nature. The ability to produce mucilage and to form hormogonia, slender motile filaments