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Xanthophyta

  • H. D. Kumar
  • H. N. Singh
Chapter

Abstract

Commonly known as yellow-green algae, the Xanthophyta include one Class, Xanthophyceae, characterized by the following general features: (1) the photosynthetic pigments consist of chlorophyll-a and -e, β carotene and xanthophylls; of these, β carotene is usually present in fairly high concentrations; (2) the food reserves are oil, lipid, and a glucose polymer termed leucosin or chrysolaminarin; (3) the cell walls when present are generally composed of two equal or overlapping halves, e.g., Tribonema (Fig. 7-1) and are composed mainly of pectic substances with smaller amounts of cellulose; in some members the cell walls may be silicified; and (4) the flagellated cells possess two anteriorly inserted flagella of unequal length, the longer being pantonematic and the shorter acronematic.
Fig. 7-1

Tribonema, portion of filament showing cell wall made of overlapping H-pieces and discoid chromatophores.

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Selected References

  1. Bold, H. C., Morphology of Plants, 2nd edn., Harper and. Row, New York (1967).Google Scholar
  2. Erben, K., Sporulation. In Lewin, R. A. (ed.) Physiology and Biochemistry of Algae, 701–707, Academic Press, New York (1962).Google Scholar
  3. Haupt, W., Intracellular movements. In Lewin, R. A. (ed.) Physiology and Biochemistry of Algae, 567–71, Academic Press, New York (1962).Google Scholar
  4. Hibberd, D. J. and Leedale, G. F., Eustigmatophyceae—a new algal class with unique organization of the motile cell, Nature, Lond., 225, 758–60 (1970).CrossRefPubMedGoogle Scholar
  5. Round, F. E., The Biology of the Algae, Edward Arnold (Publishers), London (1965).Google Scholar

Copyright information

© Affiliated East-West Press Private Limited 1979

Authors and Affiliations

  • H. D. Kumar
    • 1
  • H. N. Singh
    • 1
  1. 1.VaranasiIndia

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