![]() Most are aquatic and autotrophic (they generate food internally) and lack many of the distinct cell and tissue types, such as stomata, xylem and phloem, which are found in land plants. ![]() Included organisms range from unicellular microalgae, such as Chlorella, Prototheca and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to 50 metres (160 ft) in length. ![]() It is a polyphyletic grouping that includes species from multiple distinct clades. A variety of algae growing on the sea bed in shallow watersĪ variety of microscopic unicellular and colonial freshwater algaeĪlgae ( / ˈ æ l dʒ iː, ˈ æ l ɡ iː/ singular alga / ˈ æ l ɡ ə/) is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. ![]()
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