Cosmarium tetragonum

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Cosmarium tetragonum
Scientific classification OOjs UI icon edit-ltr.svg
(unranked): Viridiplantae
(unranked): Charophyta
Class: Zygnematophyceae
Order: Desmidiales
Family: Desmidiaceae
Genus: Cosmarium
Species:
C. tetragonum
Binomial name
Cosmarium tetragonum
(Nägeli) W.Archer in Pritchard 1861 [1]
Varieties

Cosmarium tetragonum var. elegans(Roy & Bisset) West & G.S.West 1908 [2] (syn. C. elegans)

Contents

Synonyms

Euastrum tetragonumNägeli

Cosmarium tetragonum is a species of green algae in the family Desmidiaceae. It is a freshwater species with a worldwide distribution.

Description

The nominate variety (var. tetragonum) is about 35 to 48 µm long, and 20 to 26 µm wide, 14 to 18 µm thick, with an isthmus about 6 to 12 µm long. Semicells are roughly rectangular in outline, with undulate margins; each side has about four bumps and the top side has about two bumps. [3]

Varieties

Cosmarium tetragonum is variable and several varieties have been described. They are:

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Desmidiales, commonly called the desmids, are an order in the Charophyta, a division of green algae in which the land plants (Embryophyta) emerged. Desmids consist of single-celled microscopic green algae. Because desmids are highly symmetrical, attractive, and come in a diversity of forms, they are popular subjects for microscopists, both amateur and professional.

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<i>Closterium</i> Genus of algae

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References

  1. Pritchard, A. (1861). A history of infusoria, including the Desmidiaceae and Diatomaceae, British and foreign. Fourth edition enlarged and revised by J. T. Arlidge, M.B., B.A. Lond.; W. Archer, Esq.; J. Ralfs, M.R.C.S.L. ; W. C. Williamson, Esq., F.R.S., and the author. pp. i-xii, 1- 968, 40 pls. London: Whittaker and Co., Ave Maria Lane. (description page 732)
  2. West, W. & West, G.S. (1908). A monograph of the British Desmidiaceae. III. pp. [i]-xv, [1]-274, pl. 65-95. London: The Ray Society. (description page 20)
  3. 1 2 3 4 5 Prescott, G. W.; Croasdale, H. T.; Vinyard, W. C.; Bicudo, C. E. M. (1981). A Synopsis of North American Desmids. Part II: Desmidiaceae: Placodermae. Section 3. Lincoln: University of Nebraska Press. p. 720. ISBN   9780835737920.