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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) chloroplasts arrayed one after the other 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''
*''Z. cyanosphaeroidicum''
*''Z. cylindricum''
*''Z. cylindrospermum''
*''Z. fanicum''
*''Z. gorakhporense''
*''Z. insigne''
*''Z. kashmirense''
*''Z. kiangsiense''
*''Z. leiospermum''
*''Z. melanosporum''
*''Z. momoniense''
*''Z. normanii''
*''Z. oveidanum''
*''Z. pectinatum''
*''Z. peliosporum''
*''Z. quadrispirale''
*''Z. ralfsii''
*''Z. rivulare''
*''Z. ruviatum''
*''Z. schwabei''
*''Z. spontaneum''
*''Z. stagnale''
*''Z. stellinum''
*''Z. subtile''
*''Z. tenue''
*''Z. tenuissimum''
*''Z. terrestre''
*''Z. vaginatum''
*''Z. vaucherii''
*''Z. verrucosum''
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Zygnema」の詳細全文を読む
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