Algae

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algae : a plant or plantlike organism of any of several phyla, divisions, or classes of chiefly aquatic usually chlorophyll-containing nonvascular organisms of polyphyletic origin that usually include the green, yellow-green, brown, and red algae in the eukaryotes and especially formerly the cyanobacteria in the prokaryotes — Webster See also OneLook

Encyclopedia

Algae is a 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 alga which may grow up to 50 metres (160 ft) in length. 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 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. — Wikipedia

Algae (Encyclopædia Britannica)
Algae (Biology Online)

Algae: Protists with Chloroplasts (David J. Patterson, Tree of Life)
Algae (One Zoom)
Algae (WolframAlpha)

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Science

Phycology is the scientific study of algae. Also known as algology, phycology is a branch of life science. Phycology includes the study of prokaryotic forms known as blue-green algae or cyanobacteria. A number of microscopic algae also occur as symbionts in lichens. Phycologists typically focus on either freshwater or ocean algae, and further within those areas, either diatoms or soft algae. — Wikipedia

Phycology (Encyclopædia Britannica)
Phycology (Biology Online)

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