Description: Large thallus, tubular bounded by a membrane one cell thick but compressed, slender and branched up to 60 cms long. Cells in the middle in both longitudinal and transverse rows.

Habitat: Epiphytic and epilithic in the littoral and sublittoral.

Distribution: Common around the British Isles. Europe: Mediterranean, Portugal, Spain, France, Netherlands, Baltic Sea, Norway. Atlantic coast of North America: Canada, Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut and Virginia. Further afield: Canary Islands, Caribbean; Pacific coast of North America, Ghana and Nigeria. Generally widespread.

Similar Species: Other species of Enteromorpha, microscopic examination may be required for identification.

Key Identification Features:

• Cells in both longitudinal and transverse rows.

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

iNaturalist: Enteromorpha flexuosa at iNaturalist World Species Observations database.

WoRMS: Enteromorpha flexuosa at World Register of Marine Species. Accepted name: Ulva flexuosa Wulfen, 1803. AphiaID: 234468.

Classification: Biota; Plantae; Viridiplantae; Chlorophyta; Chlorophytina; Ulvophyceae; Ulvales; Ulvaceae; Enteromorpha