Desmidiales


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Desmidiales

 

an order of green algae of the subphylum Conjugatophytina. There are 25 genera comprising 2,000 species. The Desmidiales are microscopic unicellular free-living or occasionally filamentous forms. The cells consist of two symmetrical halves with a single nucleus in the center. Each half of the cell contains a discoid chromatophore. Reproduction takes place by division into two cells on the transverse plane; the sexual process is conjugation. The zygote germinates after a period of dormancy, usually producing two new individuals. The Desmidiales live in fresh water, usually in peat marshes and in bodies of water with little lime; certain varieties are found in soil.

REFERENCE

Kosinskaia, E. K. Desmidievye vodorosli, fascicle 1. Moscow-Leningrad, 1960. (Flora sporovykh rastenii SSSR, vol. 5.)
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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