I often get asked if there are any poisonous seaweed around Britain. From my own research I discovered that Desmarestia is the only poisonous seaweed that you should leave well alone. However I wanted to double check my own knowledge against that of a world class expert.
From the category archives:
Edible Seaweed
Before collecting edible seaweed, make sure that you harvest your seaweed from clean beaches. You can check a beaches cleanliness at http://www.goodbeachguide.co.uk/.