Description: Unbranched uniseriate filaments to 5 cms or more in length. Attached or unattached.

Habitat: Common, mainly in brackish wate of the upper littoral.

Distribution: Widespread around the coasts of the British Isles. Europe: France, Netherlands, Baltic and Norway.

Similar Species: Other species of Ulothrix, Urospora and Rhizoclonium, the distinction is microscopic.

Distribution Map from NBN: Ulothrix implexa at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Ulothrix implexa at iNaturalist World Species Observations database.

WoRMS: Ulothrix implexa at World Register of Marine Species. Accepted name: Ulothrix implexa (Kützing) Kützing, 1849. AphiaID: 145927.

Classification: Biota; Plantae; Viridiplantae; Chlorophyta; Chlorophytina; Ulvophyceae; Ulotrichales; Ulotrichaceae; Ulothrix