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In fact, the polysaccharides are often classified according to the hexoses which they yield on hydrolysis, into the following groups: the dextrosans, which yield glucose, and include starch, dextrin, glycogen, lichenin, etc.; the levulosans, which yield fructose, and include inulin, graminin, triticin, etc.; the mannans; and the galactans.

Lichenin, para dextran, and para isodextran are dextrosans which have been isolated from various lower plants.

Iceland Moss contains the form of starch called "lichenin."

Lichenin is a variety of starch occurring in Cetraria islandica, or Iceland moss.