Vaucheria is a curiousity among the seaweeds. Its build and reproduction varies so much from other seaweeds that this plant has been placed in a separate group in the plant kingdom. It is a pioneer plant, which forms large thick mats on lightly brackish and freshwater tidal flats. This plant catches mud and sand that wash over it. In this way, it helps the flats to grow higher, eventually developing into a salt marsh.