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a genus of filamentary green algae of the subphy-lum Conjugatophytina. The filaments of a spirogyra consist of a single row of cells containing one or more spiral ribbons of chlo-roplasts. Reproduction is sexual and vegetative, with the filaments breaking into parts. There are ...

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...

... of fusion of gametes, and Conjugatophytina. The first subphylum is divided into six classes: Protococcophyceae or Chlorococcophyceae, Volvocophyceae, Ulotrichophyceae, Siphonocladophyceae, Dasycladophyceae, and Siphonophyceae. There are approximately 5,700 known species of green algae, belonging to 360 genera. They are distributed mainly in freshwater environments but ...