Ulothrix Kützing   

Kingdom: Plantae
Phylum: Chlorophyta – green algae
Class: Ulvophyceae
Order: Codiolales

British distribution (genus): Widespread, freshwater and marine.
World distribution (genus): Throughout most of the world.

The gametophyte (shown here) is a filamentous, usually unbranched green alga, characterised by its ring- or band-like chloroplasts with one to several pyrenoids. Filaments may be free-floating in small pools but are more often attached by a basal cell to stones and boulders in streams and on rocky shores, or mat-forming in saltmarshes, depending on species.

The sporophyte (not shown) is unicellular.

Photograph of unnamed species in culture, 1998.

© A.J. Silverside
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