 It tells the story of Ireland's traditional seaweed gatherers who've been collecting a kind of edible seaweed called channelled wrack for hundreds of years. Seaweed is an umbrella term that doesn't really do justice to the complexity of this diverse sub-aquatic organism. In fact, we use the word seaweed for a range of marine algae, red, brown and green. Some varieties are anchored to the seabed, some cling to rocks,