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Family Closteriaceae

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Chapter Summary

In Europe the family Closteriaceae involves a single genus, Closterium, that in the lowlands is represented by sixty species. Some of them are characteristically shaped, others are hard to distinguish from related species. In a number of them the taxonomic status is even questionable as they appear to be mutually connected by intermediate forms. A relevant parameter in identification is the method of cell wall formation at cell division. Referring to this, two groups may be distinguished: species without girdle bands and species characterized by girdle bands. Some of the species of Closterium are Closterium abruptum, Closterium acerosum, Closterium aciculare, Closterium acutum and Closterium angustatum. Closterium abruptum cells are slightly curved, in the midregion often straight and cylindric, towards the ends gradually attenuated. Closterium acerosum cells are very slightly curved to almost straight, in the midregion with more or less parallel margins, tapering towards the poles.

Keywords: Closteriaceae; Closterium abruptum; Closterium acerosum; Closterium aciculare; Closterium acutum; Closterium angustatum



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