Plant
Algae comprise several different groups of organisms which produce food by photosynthesis and thus have traditionally been included in the plant kingdom. The seaweeds range from large multicellular algae to single-celled organisms and are classified into three groups, the brown, red and green algae. There is good evidence that the brown algae evolved independently from the others, from non-photosynthetic ancestors that formed endosymbiotic relationships with red algae rather than from cyanobacteria, and they are no longer classified as plants as defined here.
Northern Ireland
Algae/seaweed.
356 species of marine algae have been recorded in the north-east of Ireland. As Counties Londonderry, Antrim and Down are the only three counties of Northern Ireland with a shoreline this will apply to all Northern Ireland. 77 species are considered rare having been recorded rarely.