Algae - Chlorella (each). Small, unicellular. Each unit comes in a 2 oz. jar.
The Chlorophyta or green algae consist of about 7,000 species, most of which occur in fresh water, although some others are marine. Most green algae are microscopic, but a few species, such as those in the genus Cladophora, are multicellular and macroscopic. The cell walls of green algae are mostly constructed of cellulose, with some incorporation of hemicellulose, and calcium carbonate in some species. The food reserves of green algae are starch, and their cells can have two or more organelles known as flagella, which are used in a whiplike fashion for locomotion. The photosynthetic pigments of green algae are chlorophylls a and b, and their accessory pigments are carotenoids and xanthophylls.
Some common examples of green algae include the unicellular genera Chlamydomonas and Chlorella, which have species dispersed in a wide range of habitats. More complex green algae include Gonium, which forms small, spherical colonies of four to 32 cells, and Volvox, which forms much larger, hollow-spherical colonies consisting of tens of thousands of cells. Some other colonial species are much larger, for example, Cladophora, a filamentous species that can be several meters long, and Codium magnum, which can be as long as 26 ft (8 m).
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