Ulothrix is a genus of green algae in the family Ulotrichaceae.
Ulothrix is a genus of non-branching filamentous green algae, generally found in fresh and marine water. Its cells are normally as broad as they are long, and they thrive in the low temperatures of spring and winter. They become attached to surfaces by a modified holdfast cell. Reproduction is normally vegetative. They are Eukaryotic and multicellular because the cells have specific functions as the lowermost cell serves as holdfast and it doesn't have chloroplast, and the apical cell is dome-shaped.
The genus includes:
Ulothrix aequalis Kützing
Ulothrix moniliformis Kützing
Ulothrix flacca (Dillwyn) Thuret in Le Jolis
Ulothrix implexa (Kützing) Kützing
Ulothrix speciosa (Carmichael ex Harvey in Hooker) Kützing
Ulothrix tenerrima Kützing
Ulothrix tenuissima Kützing
Ulothrix zonata (Weber et Mohr) Kützing