Description: Thallus filamentous, large and well branched to 35 cms long.

Habitat: Usually free-floating in sheltered estuaries and harbours.

Distribution: Few records from the British Isles but possibly much under-recorded. Europe: Mediterranean, Atlantic coast of France, Netherlands, Norway. Atlantic coast of North America: Canada, Massachusetts, Connecticut and Long Island and Virginia. Further afield: Arctic U.S.S.R.

Similar Species: Most species of Cladophora are similar and difficult to identify, may be under-recorded.

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

iNaturalist: Cladophora liniformis at iNaturalist World Species Observations database.

WoRMS: Cladophora liniformis at World Register of Marine Species.