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Algae (singular alga) encompass several groups of relatively simple, eukaryotic, living aquatic organisms that capture light energy through photosynthesis, using it to convert inorganic substances into organic matter.wp.
Algae are photosynthetic organisms that occur in most habitats. Algae varies from small, single-celled forms to complex multicellular forms, such as the giant kelps that grow to 65 meters in lengthwp.
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There are far too many varieties to list, with thousands known. Here are some which stand out.
- Arthrospira platensis, commercially cultivated as a nutritional supplement, is a Cyanobacteria (known as blue-green algae), and has been hailed by some as a superfood.
- Chlorella (a green algae), commercially cultivated as a nutritional supplementwp.
- Dunaliella (Dunaliella salina), commercially cultivated as a nutritional supplement, is high in beta-carotene and is used in vitamin C supplementswp.
- Fat choy (which is actually a cyanobacterium), popular in China as a "vegetable".
- Palmaria palmata (Rhodymenia palmata, common name: dulse).  A red alga which is dried and may be bought in shops in Ireland. It is eaten raw, fresh or dried, or cooked like spinach.
- Durvillaea antarctica  is eaten in Chile, common name: cochayuyo. 
- Porphyra (common name: purple laver), is also collected and eaten in many ways around the world.
- Chondrus crispus, (probably confused with Mastocarpus stellatus, common name: Irish moss), is used as "carrageen" for the stiffening of milk and dairy products, such as ice-cream.
- Ulva lactuca (common name: sea lettuce), added to soups or used in salads in Scotland.
- Alaria esculenta (common name: dabberlocks), is used either fresh or cooked.
- Atractophora hypnoides P.L.Crouan and H.M.Crouan (red algae)
- Ascophyllum nodosum
- Charales (green algae)
- Chondrus crispus
- Ulva lactuca
- Mastocarpus stellatus
- Pelvetia canaliculata
- Palmaria palmata
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Seaweed is used as a fertiliser
Algal blooms can present problems for ecosystems and human society
- Brown Algae
- Coralline algae
- Golden Algae
- Green Algae
- Hydrology transport model
- Red Algae
- Yellow-Green Algae
- w:Algae. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
- Algae QR Code (Size 50, 100, 200, 500)
- AlgaeBase - a comprehensive database of over 35,000 Algae (132,000 names), including seaweeds, with over 5000 images and some 40,000 references.
- www.phyco.org; a wiki-based site that is focused on energy production from algae.
- biodieselnow.com biodiesel production-biodiesel from algae
- Australian freshwater algae - Sydney Botanic Gardens
- Learn about Algae & Algal Blooms - Rural Chemical Industries (Aust.) Pty Ltd.
- Harmful Algal Blooms - "Red tide" - National Office for Marine Biotoxins and Harmful Algal Blooms, USA.
- Patent ListingAlgae Related United States Patents
- Algae Section, National Museum of Natural History - Smithsonian Institution
- Algae Growth
- Blanket Weed
- British Phycological Society
- Seaweed site by Michael Guiry
- http://www.ucmp.berkeley.edu/protista/rhodophyta.html - Introduction to Rhodophyta]
- http://www.marlin.ac.uk - Marlin
- http://www.mbari.org/staff/conn/botany/flora/reds.htm - Monterey Bay Flora
- http://www.mbari.org/staff/conn/botany/flora/browns.htm - Monterey Bay Flora
- http://www.mbari.org/staff/conn/botany/flora/green.htm - Monterey Bay Flora