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Plant Systematics and Evolution

, Volume 137, Issue 1–2, pp 107–126 | Cite as

Die neue KlasseChlamydophyceae, eine natürliche Gruppe der Grünalgen (Chlorophyta)

Article

The new classChlamydophyceae, a natural group of the Green Algae (Chlorophyta)

Abstract

On the basis of the present concept of theChlorophyta, a new class, theChlamydophyceae, is established and described. It includes allVolvocales with cell walls, theTetrasporales and thoseChlorococcales with zoospores of theChlamydomonas-type. The diagnostic features of theChlamydophyceae are as follows. Both, flagellates and zoospores have a cell wall with specific ultrastructure which lacks cellulose. The cell wall of the gametes is thrown off before or during fusion. Protoplast divisions are multiple (schizogonic); binary (schizotomic) fissions do not occur. Sporangia and gametangia are formed already on the monadoid level. In asexual resting stages the old cell wall is incorporated into the cyst wall. The polarized structure of theChlamydomonas-like flagellate is ± maintained in non-motile stages. Contractile vacuoles occur in freshwater species, and only sometimes disappear in adult and old non-motile cells; proper central vacuoles are lacking.—From the morphological point of viewChlamydophyceae can be derived from stages in the life cycle ofChlamydomonas. Relationships with theChlorophyceae s. str. and the other Green Algae are discussed.

Key words

Chlorophyta Chlamydophyceae cl. n. Taxonomy morphology reproduction systematic conclusions 

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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • H. Ettl
    • 1
  1. 1.Botanischen Institut der Tschechoslowakischen AkademieWissenschaften, Arbeitsstelle BrnoBrněnecČSSR

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