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Diagnostic features

Unicellular desmid with long cylindrical cells, with a wavy outline in some species, divided into two semicells. The semicells may have swollen ends at the point they meet, either side of a shallow constriction or isthmus, which may be surrounded by a ring.  One green chloroplast with pyrenoids per semicell.

Typical habitats

Found in wetlands and other acidic waters


Kingdom Plantae
Phylum Charophyta
Class Zygnemophyceae
Order Desmidiales
Family Desmidiaceae
Common name Green algae