green algae

noun
any grass-green, chiefly freshwater algae of the phylum Chlorophyta, often growing on wet rocks, damp wood, or on the surface of stagnant water.

Origin:
1900–05

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Collins
World English Dictionary
green algae
 
pl n
the algae of the phylum Chlorophyta, which possess the green pigment chlorophyll. The group includes sea lettuce and spirogyra

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

green algae

members of the division Chlorophyta, comprising between 9,000 and 12,000 species. The photosynthetic pigments (chlorophylls a and b, carotene, and xanthophyll) are in the same proportions as those in higher plants. The typical green algal cell, which can be motile or nonmotile, has a central vacuole, pigments contained in plastids that vary in shape in different species, and a two-layered cellulose and pectin cell wall. Food is stored as starch in pyrenoids (proteinaceous cores within the plastids). Green algae, variable in size and shape, include single-celled (Chlamydomonas, desmids), colonial (Hydrodictyon, Volvox), filamentous (Spirogyra, Cladophora), and tubular (Actebularia, Caulerpa) forms. Sexual reproduction is common, with gametes that have two or four flagella. Asexual reproduction is by cell division (Protococcus), motile or nonmotile spores (Ulothrix, Oedogonium), and fragmentation.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Made of an even cheaper grade of plastic, a film of green algae developed on
  the bottom of my test unit after a week.
To make neurons sensitive to light, scientists genetically engineer them to
  carry a protein adapted from green algae.
Many of the fossils closely resemble species of blue-green algae found all over
  the world today.
During the day, the animal's fleshy mantle-which contains green algae-spreads
  over its open shell to take in sunlight.
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