The first subkingdom. Thallophyta, includes many unusual plants. Although most plants have little movement and are anchored to one spot by roots ; several plants in this classification have no roots or have free floating roots. For example, algea can be found in this classification, as can seaweed.
The other subkingdom, Embryophyta, comtains most of the ferns, grasses, vegetables, flowers, shrubs, and trees we think of as plants. But even here we can find unusual plants. For example, although moss is green, it has no real roots, And fungus is not green because it draws its nutrition from other trees or plants rather than producing its own food.