AlgaeBase: A database of information on algae that includes terrestrial, marine and freshwater organisms.
Australasian Society for Phycology and Aquatic Botany: Society information, resources, and links.
European Journal of Phycology: Publishes papers on all aspects of algae, including cyanobacteria.
Guide to Pressing Seaweed: Includes instructions on collecting and pressing seaweed, ideas for science and art activities..
Indian Ocean Benthic Algae: On-line version of the Catalogue of Benthic Marine Algae of the Indian Ocean, with indexes, geographical lists, bibliographies, and search capacity.
Northwest Algal Symposium: Phycologists from the Northwestern United States and Western Canada: includes contact and activity information.
Phycological Society of America: Information about the society dedicated to the study of algae, its publications and links to other phycological sites.
Seaweed: This site has a lot of information on all aspects of seaweeds and marine algal biology.