Seaweed descriptions and pictures

Here is a selection of 200 or so of the larger seaweeds from the north-eastern Atlanic, many of which occur in Norway, Britain, Ireland, Atlantic France and Spain, and in Portugal. Web pages have so far been completed for those with links (underlined). Please bear with me while the descriptions and pictures are refined. It is also intended to provide a synoptic, interactive key later. Suggestions for additions and corrections to Michael Guiry. Where there is no common name in brackets, none exists.

Fact sheets for Irish macroalgae

Edwards, M., Hanniffy, D., Heesch, S., Hernández-Kantún, J., Moniz, M., Queguineur, B., Ratcliff, J., Soler-Vila, A., & Wan, A. (2012). Macroalgae Fact-sheets. Edited by Soler-Vila, A., & Moniz, M. 40 pp. Download.

Brown algae (Kelps, wracks, etc.)

Red algae (Dulse, Carrageen Moss, etc.)


Patella vulgata © M.D. Guiry

Green algae (Sea Lettuce, etc.)


Zostera marina © M.D. Guiry

Seagrasses (A flowering plant, not an alga)

Photographs on this page © M.D. Guiry

Last modified: July 26 2018