''Zygnema'' is a genus of freshwater filamentous wikt:thalloid, 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 (biology), 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) chloroplasts arrayed along the axis of the cell.

Species

Some species include: *Zygnema atrocoeruleum, ''Z. atrocoeruleum'' *Zygnema binuclearioides, ''Z. binuclearioides'' *Zygnema carinthiacum, ''Z. carinthiacum'' *Zygnema carteri, ''Z. carteri'' *Zygnema circumcarinatum, ''Z. circumcarinatum'' *Zygnema coeruleum, ''Z. coeruleum'' *Zygnema conspicuum, ''Z. conspicuum'' *Zygnema cruciatum, ''Z. cruciatum'' *Zygnema cyanosphaeroidicum, ''Z. cyanosphaeroidicum'' *Zygnema cylindricum, ''Z. cylindricum'' *Zygnema cylindrospermum, ''Z. cylindrospermum'' *Zygnema fanicum, ''Z. fanicum'' *Zygnema gorakhporense, ''Z. gorakhporense'' *Zygnema insigne, ''Z. insigne'' *Zygnema kashmirense, ''Z. kashmirense'' *Zygnema kiangsiense, ''Z. kiangsiense'' *Zygnema leiospermum, ''Z. leiospermum'' *Zygnema melanosporum, ''Z. melanosporum'' *Zygnema momoniense, ''Z. momoniense'' *Zygnema normanii, ''Z. normanii'' *Zygnema oveidanum, ''Z. oveidanum'' *Zygnema pectinatum, ''Z. pectinatum'' *Zygnema peliosporum, ''Z. peliosporum'' *Zygnema quadrispirale, ''Z. quadrispirale'' *Zygnema ralfsii, ''Z. ralfsii'' *Zygnema rivulare, ''Z. rivulare'' *Zygnema ruviatum, ''Z. ruviatum'' *Zygnema schwabei, ''Z. schwabei'' *Zygnema spontaneum, ''Z. spontaneum'' *Zygnema stagnale, ''Z. stagnale'' *Zygnema stellinum, ''Z. stellinum'' *Zygnema subtile, ''Z. subtile'' *Zygnema tenue, ''Z. tenue'' *Zygnema tenuissimum, ''Z. tenuissimum'' *Zygnema terrestre, ''Z. terrestre'' *Zygnema vaginatum, ''Z. vaginatum'' *Zygnema vaucherii, ''Z. vaucherii'' *Zygnema verrucosum, ''Z. verrucosum''

References

Zygnemataceae Charophyta genera {{alga-stub