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Nostoc is a type of cyanobacteria, often referred to as blue-green algae, although it is not a true algae. It is a photosynthetic bacterium that thrives in moist environments and can form gelatinous, slimy masses. Nostoc can be found in a variety of habitats, such as soil, gravel, and aquatic ecosystems. It often grows in areas with high moisture and nutrients, such as wetlands, lawns, and driveways. Despite its algae-like appearance, nostoc is classified as a bacterium due to its distinct cellular structure. It plays a role in nitrogen fixation and can sometimes form blooms in certain environments.
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