Zygnema

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.
Numbered ticks are 122 µm apart.
Scientific classification
Kingdom:
Plantae
Division:
Charophyta
Class:
Zygnematophyceae
Order:
Zygnematales
Family:
Zygnemataceae
Genus:
Zygnema

C. Agardh, 1817
Synonyms
  • Globulina Link in Nees 1820[1]
  • Lucernaria Roussel, 1806[2][1]
  • Pleurodiscus Lagerheim, 1895[3][1]
  • Rhynchonema Kützing, 1849[1]
  • Stellulina Link, 1833[1]
  • Thwaitesia Montagne, 1845[1]
  • Tyndaridea Bory de Saint-Vincent 1822[1]
  • Tendaridea Bory de Saint-Vincent 1822[1]
  • Tendaridella Gaillon, 1833[1]

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

References
  1. 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.
  2. "Algaebase, entry for Lucernaria". Retrieved 20 February 2016.
  3. "Algaebase, entry for Pleurodiscus". Retrieved 9 September 2014.
  4. 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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