Description: Thallus tubular to 20 cms long, repeatedly branched.

Habitat: Relatively rare. Epilithic and epiphytic in rock pools in the littoral.

Distribution: Widely distributed in the British Isles. Europe: Mediterranean, Spain, France, Baltic Sea, Norway, Faroes and Iceland. Atlantic coast of North America: Canada, Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, New Jersey, Maryland and Virginia. Further afield: Arctic Sea Baffin Bay and Greenland, Canary Islands, Caribbean, Pacific coast of North America, Galapagos Islands and Kamchatka.

Similar Species: Other species of Enteromorpha, microscopic examination required for confident determination.

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

iNaturalist: Enteromorpha crinita at iNaturalist World Species Observations database.

WoRMS: Enteromorpha crinita at World Register of Marine Species. Accepted name: Ulva clathrata (Roth) C.Agardh, 1811. AphiaID: 156078.

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