Phylum: Chlorophyta   Family: Cladophoraceae

Chaetomorpha linum  (O.F. Müller) Kützing, 1845

Spaghetti Algae

Occurs as an unattached and attached plant. Attached plants have a disc holdfast and are found in the mid to lower intertidal range. Unattached plants form entwined balls, hence the spaghetti name. Common

References: 
Brodie, Maggs & John (2007) - Green Seaweeds of Britain and Ireland;
Burrows (2013) - Seaweeds of the British Isles, Volume 2 Chlorophyta