The botanical magazine = Shokubutsu-gaku-zasshi

, Volume 98, Issue 3, pp 251–262 | Cite as

Morphology and ultrastructure ofOlisthodiscus luteus (Raphidophyceae) with special reference to the taxonomy

  • Yoshiaki Hara
  • Isao Inouye
  • Mitsuo Chihara


A flattened discoid flagellate collected from the Seto Inland Sea, Japan, has been examined by light and electron microscopy. This alga agrees well withClisthodiscus luteus Carter. It has two heterodynamic flagella emerging from a furrow on the upward side of the cell that contains six to 13 yellow-green parietal chloroplasts. It does not rotate but smoothly glide while swimming. The cell has a thin periplast lying between the plasmalemma and chloroplasts. Neither lipid bodies nor mucocysts are seen in the periplast. The pyrenoid matrix being free from thylakoids is penetrated by several cytoplasmic canals from various directions. There are no vesicles of periplastidal network in the narrow space between chloroplast envelope and chloroplast ER.

The ultrastructural features ofO. luteus are unique, sharing certain characters with the raphidophycean algae but others withPseudopedinella pyriformis, a unique member of the Chrysophyceae.

Key words

Heterosigma Olisthodiscus luteus Raphidophyceae Red tide flagellate Taxonomy ofOlisthodisus Ultrastructure ofOlisthodisus 


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Copyright information

© The Botanical Society of Japan 1985

Authors and Affiliations

  • Yoshiaki Hara
    • 1
  • Isao Inouye
    • 1
  • Mitsuo Chihara
    • 1
  1. 1.Institute of Biological SciencesUniversity of TsukubaIbaraki

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