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 along the axis of the cell.
| Zygnema | |
|---|---|
| Zygnema, showing characteristic dual star-shaped chloroplasts. Numbered ticks are 20 μm apart. | |
| Numbered ticks are 122 μm apart. | |
| Scientific classification | |
| (unranked): | Viridiplantae |
| (unranked): | Charophyta |
| Class: | Zygnematophyceae |
| Order: | Zygnematales |
| Family: | Zygnemataceae |
| Genus: | Zygnema C. Agardh, 1817 |
| Synonyms | |
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