Seaweed descriptions and pictures of Seweeds of the Noth-east Atlantic

Here is a selection of 250 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 be patient 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, we have not discovered one.

Information on drift seeds and fruits.

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.)

*=adventive species


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: October 13 2020