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Diagnostic features

Unbranched filamentous chlorophyte with generally short cells, each of which has a parietal band-like chloroplast wrapped around most of the interior cell surface, containing numerous pyrenoids. Germination of zoosporangia is sometimes observed in collected material, producing numerous small zoospores, each with 4 flagella, per cell (cf. Klebsormidium, in which this is very rarely seen, and results in a single biflagellate zoospore per sporangium). Ulothrix also lacks the elbow-structures with mucilage pads found in Klebsormidium.

Typical habitats

Commonly attached to the bed of good quality streams and rivers.


Kingdom Plantae
Phylum Chlorophyta
Class Ulvophyceae
Order Ulotrichales
Family Ulotrichaceae
Common name Green algae