Phylum: Ochrophyta   Family: Fucaceae

Fucus vesiculosus var. linearis (Hudson) Kützing, 1849

Bladder Wrack; Black Tang

A bladderless variety found on exposed shores where having bladders is a disadvantage. Often shorter than Fucus vesiculosus with the fronds more tiered, giving a bulkier appearance

References: 
Fish & Fish (2011) - A Student's Guide to the Seashore