Zygnema is a genus of freshwater filamentous thalloid alga comprising about 100 species.[4] 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. | |
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| Numbered ticks are 122 μm apart. | |
Scientific classification 
| |
| Clade: | Viridiplantae |
| (unranked): | Charophyta |
| Class: | Zygnematophyceae |
| Order: | Zygnematales |
| Family: | Zygnemataceae |
| Genus: | Zygnema C. Agardh, 1817 |
| Synonyms | |
Species
editSome 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
References
edit- ^ a b c d e f g h i Guiry, M.D. (2013). Taxonomy and nomenclature of the Conjugatophyceae (=Zygnematophyceae). Archived March 5, 2016, at the Wayback Machine Algae. An International Journal of Algal Research 28: 1-29.
- ^ "Algaebase, entry for Lucernaria". Retrieved 20 February 2016.
- ^ "Algaebase, entry for Pleurodiscus". Retrieved 9 September 2014.
- ^ Guiry, M.D.; Guiry, G.M. (2008). "Zygnema". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2009-02-21.
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