Zygnema
''Zygnema'' is a genus of freshwater filamentous thalloid alga comprising about 100 species. A terrestrial species, ''Z. terrestre'', is known from India. ''Zygnema'' grows as a free-floating mass of filaments, although young plants may be found anchored to streambeds with a holdfast. The filaments form a yellow-green to bright green colored tangled mat, and are composed of elongate barrel-shaped cells, each with two star-shaped (stellate) chloroplast A chloroplast () is a type of membrane-bound organelle, organelle known as a plastid that conducts photosynthesis mostly in plant cell, plant and algae, algal cells. Chloroplasts have a high concentration of chlorophyll pigments which captur ...s arrayed along the axis of the cell. Species Some species include: * ''Z. atrocoeruleum'' * ''Z. binuclearioides'' * ''Z. carinthiacum'' * ''Z. carteri'' * ''Z. circumcarinatum'' * ''Z. coeruleum'' * ''Z. conspicuum'' * ''Z. cruciatum'' * ' ...
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