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Mucilage is a thick gluey substance produced by most plants and some microorganisms. Mucilage is an exopolysaccharide—a polymer composed of sugar residues and secreted by a microorganism into the surrounding environment. The substance covers the outside of, for example, unicellular or filamentous green algae and cyanobacteria. Amongst the green algae especially, the group Volvocales are known to produce exopolysaccharides in a certain part of their life cycle.