𞋏𞋁𞋔 𞋈𞋕

Alga" redirects here. For other uses, see Algae (disambiguation) and Alga (disambiguation). Algae An informal term for a diverse group of photosynthetic eukaryotes Temporal range: Mesoproterozoic–present[1][2] Pha.ProterozoicArcheanHad. A variety of algae growing on the sea bed in shallow waters A variety of algae growing on the sea bed in shallow waters A variety of microscopic unicellular and colonial freshwater algae A variety of microscopic unicellular and colonial freshwater algae Scientific classificationEdit this classification Groups included Archaeplastida Viridiplantae/green algae Mesostigmatophyceae Chlorokybophyceae Chlorophyta Charophyta Rhodophyta (red algae) Glaucophyta Chlorarachniophytes Euglenids Heterokonts Bacillariophyceae (Diatoms) Axodines Bolidomonas Eustigmatophyceae Phaeophyceae (brown algae) Chrysophyceae (golden algae) Raphidophyceae Synurophyceae Xanthophyceae (yellow-green algae) Cryptophyta Dinoflagellata Haptophyta Typically excluded Cyanobacteria (blue-green algae) Algae (UK: /ˈælɡiː/, US: /ˈældʒiː/;[3] singular alga /ˈælɡə/) is an informal term for a large and diverse group of photosynthetic, eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular microalgae, such as Chlorella, Prototheca and the diatoms, to multicellular forms, such as the giant kelp, a large brown algae which may grow up to 50 metres (160 ft) in length. Most are aquatic 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 which includes, for example, Spirogyra and stoneworts.

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