This is an image-based 'polytomous' key good for initial identification of many freshwater algae. It is especially useful for the beginning student. The key was developed at the University of New Hampshire under the direction of Al Baker and dedicated to George J. Schumacher and Alan J. Brook.AlgaeBase:
AlgaeBase is a large database on algae living in freshwater, marine and terrestrial habitats. This site is particularly useful for taxonomic information, especially at the species level.Index Nominum Algarum:
This large database of algal names and associated information is maintained at the University of California, Berkeley herbarium. The collection is dedicated to Paul C. Silva.