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- Algae abstract ""Alga" redirects here. For places called Alga, see Alga (disambiguation). For other uses, see Algae (disambiguation).Algae (/ˈældʒiː/ or /ˈælɡiː/; singular alga /ˈælɡə/) is an informal term for a large, diverse group of eukaryotes that are not necessarily closely related and are thus polyphyletic. Included organisms range from unicellular genera, such as Chlorella and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga that may grow up to 50 meters in length. Most are aquatic and autotrophic and lack many of the distinct cell and tissue types, such as stomata, xylem and phloem, that are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae that includes, for example, Spirogyra and the stoneworts.There is no generally accepted definition of algae. One definition is that algae "have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells". Some authors exclude all prokaryotes and thus do not consider cyanobacteria (blue-green algae) as algae.Algae constitute a polyphyletic group since they do not include a common ancestor, and although their plastids seem to have a single origin, from cyanobacteria, they were acquired in different ways. Green algae are examples of algae that have primary chloroplasts derived from endosymbiotic cyanobacteria. Diatoms are examples of algae with secondary chloroplasts derived from an endosymbiotic red alga.Algae exhibit a wide range of reproductive strategies, from simple asexual cell division to complex forms of sexual reproduction.Algae lack the various structures that characterize land plants, such as the phyllids (leaf-like structures) of bryophytes, rhizoids in nonvascular plants, and the roots, leaves, and other organs that are found in tracheophytes (vascular plants). Most are phototrophic, although some groups contain members that are mixotrophic, deriving energy both from photosynthesis and uptake of organic carbon either by osmotrophy, myzotrophy, or phagotrophy. Some unicellular species of green algae, many golden algae, euglenids, dinoflagellates and other algae have become heterotrophs (also called colorless or apochlorotic algae), sometimes parasitic, relying entirely on external energy sources and have limited or no photosynthetic apparatus. Some other heterotrophic organisms, like the apicomplexans, are also derived from cells whose ancestors possessed plastids, but are not traditionally considered as algae. Algae have photosynthetic machinery ultimately derived from cyanobacteria that produce oxygen as a by-product of photosynthesis, unlike other photosynthetic bacteria such as purple and green sulfur bacteria. Fossilized filamentous algae from the Vindhya basin have been dated back to 1.6 to 1.7 billion years ago.".
- Algae thumbnail NSW_seabed_1.JPG?width=300.
- Algae wikiPageExternalLink www.algaebase.org.
- Algae wikiPageExternalLink mflora.htm.
- Algae wikiPageExternalLink index.html.
- Algae wikiPageExternalLink cryptogamicbotan031880mbp.
- Algae wikiPageExternalLink main?stype=lite&keyword=algae&event=display&Submit=Go&start=1.
- Algae wikiPageExternalLink ?note_id=52.
- Algae wikiPageExternalLink www.enalgae.eu.
- Algae wikiPageExternalLink index.html.
- Algae wikiPageID "633".
- Algae wikiPageLength "69942".
- Algae wikiPageOutDegree "415".
- Algae wikiPageRevisionID "683433624".
- Algae wikiPageWikiLink 10th_edition_of_Systema_Naturae.
- Algae wikiPageWikiLink A_Coruña.
- Algae wikiPageWikiLink Abalone.
- Algae wikiPageWikiLink Action_potential.
- Algae wikiPageWikiLink Action_potentials.
- Algae wikiPageWikiLink Aerobiology.
- Algae wikiPageWikiLink Agar.
- Algae wikiPageWikiLink Agricultural_Research_Service.
- Algae wikiPageWikiLink Alaria_esculenta.
- Algae wikiPageWikiLink Alga_(disambiguation).
- Algae wikiPageWikiLink Algaculture.
- Algae wikiPageWikiLink AlgaeBase.
- Algae wikiPageWikiLink AlgaePARC.
- Algae wikiPageWikiLink Algae_(disambiguation).
- Algae wikiPageWikiLink Algae_scrubber.
- Algae wikiPageWikiLink Algal_bloom.
- Algae wikiPageWikiLink Algal_turf_scrubber.
- Algae wikiPageWikiLink Alginic_acid.
- Algae wikiPageWikiLink Alpha-Linolenic_acid.
- Algae wikiPageWikiLink Alpha-linolenic_acid.
- Algae wikiPageWikiLink Alternation_of_generations.
- Algae wikiPageWikiLink Alveolata.
- Algae wikiPageWikiLink Alveolate.
- Algae wikiPageWikiLink Ambiregnal_protist.
- Algae wikiPageWikiLink Amoeba.
- Algae wikiPageWikiLink Amoeboid.
- Algae wikiPageWikiLink Ancient_Greek.
- Algae wikiPageWikiLink Animal.
- Algae wikiPageWikiLink Animalia.
- Algae wikiPageWikiLink Antarctica.
- Algae wikiPageWikiLink Aonori.
- Algae wikiPageWikiLink Apicomplexa.
- Algae wikiPageWikiLink Apicomplexan.
- Algae wikiPageWikiLink Apicomplexans.
- Algae wikiPageWikiLink Apicoplast.
- Algae wikiPageWikiLink Aquaculture.
- Algae wikiPageWikiLink Aquatic_plant.
- Algae wikiPageWikiLink Arachidonic_acid.
- Algae wikiPageWikiLink Archaeplastida.
- Algae wikiPageWikiLink Ascomycota.
- Algae wikiPageWikiLink Asexual_reproduction.
- Algae wikiPageWikiLink Asphyxia.
- Algae wikiPageWikiLink Asphyxiate.
- Algae wikiPageWikiLink Autotroph.
- Algae wikiPageWikiLink Autotrophic.
- Algae wikiPageWikiLink Axodine.
- Algae wikiPageWikiLink Bacillariophyceae.
- Algae wikiPageWikiLink Bacteria.
- Algae wikiPageWikiLink Ballantine_Scale.
- Algae wikiPageWikiLink Ballantine_scale.
- Algae wikiPageWikiLink Basidiomycota.
- Algae wikiPageWikiLink Benthic.
- Algae wikiPageWikiLink Benthic_zone.
- Algae wikiPageWikiLink Beta-Carotene.
- Algae wikiPageWikiLink Beta-carotene.
- Algae wikiPageWikiLink Binomial_nomenclature.
- Algae wikiPageWikiLink Biodegradation.
- Algae wikiPageWikiLink Biological_life_cycle.
- Algae wikiPageWikiLink Biotechnology.
- Algae wikiPageWikiLink Bolidomonas.
- Algae wikiPageWikiLink Bolidophyceae.
- Algae wikiPageWikiLink Botanical_nomenclature.
- Algae wikiPageWikiLink British_Columbia.
- Algae wikiPageWikiLink Brown_algae.
- Algae wikiPageWikiLink Bryophyte.
- Algae wikiPageWikiLink Bryophytes.
- Algae wikiPageWikiLink Calcareous.
- Algae wikiPageWikiLink Calcium.
- Algae wikiPageWikiLink Carbon_dioxide.
- Algae wikiPageWikiLink Carl_Linnaeus.
- Algae wikiPageWikiLink Carotenoid.
- Algae wikiPageWikiLink Category:Algae.
- Algae wikiPageWikiLink Category:Endosymbiotic_events.
- Algae wikiPageWikiLink Cell_nucleus.
- Algae wikiPageWikiLink Cephaleuros.
- Algae wikiPageWikiLink Cercozoa.
- Algae wikiPageWikiLink Chara_(alga).
- Algae wikiPageWikiLink Characeae.
- Algae wikiPageWikiLink Charales.
- Algae wikiPageWikiLink Charophyta.
- Algae wikiPageWikiLink Charophyte.
- Algae wikiPageWikiLink Chile.
- Algae wikiPageWikiLink Chlorarachniophyte.
- Algae wikiPageWikiLink Chlorarachniophytes.
- Algae wikiPageWikiLink Chlorella.
- Algae wikiPageWikiLink Chlorochytrium.