Phylum: Chlorophyta   Family: Ulvaceae

Ulva clathrata (Roth) C. Agardh, 1811

Spiky Tendrils

Quite distinct from other Ulva species with its prolific and irregular branching. It can form extensive mats in sheltered areas. Tolerant of low salinity

References: 
Brodie, Maggs & John (2007) - Green Seaweeds of Britain and Ireland