AlgaeBase is a database of information on algae that includes terrestrial, marine and freshwater organisms available free on the internet. For convenience, the sea-grasses are included (about 60 species), even though they are flowering plants. Data include nomenclatural, taxonomic, systematic, distribution, common names, and images of algae. To date, approximately 35,000 species are included and about 150,000 names. Classification is provided at the Kingdom, Phylum, Class, Order and Family levels for each included genus. About 7,500 algal generic names have been identified. Some 250,000 distributional records from 250 countries, states and territories have been databased for about 35,000 names. AlgaeBase is supported by donations from private sources and by funding via the LifeWatch programme. The data are currently the property of AlgaeBase Ltd, a non-profit company registered in the Republic of Ireland.