Fern is a common name for the cryptogamous (spore-producing) plants belonging to the division Filicophyta, also called Filicinophyta. They are primitive vascular plants with true roots, stems, and complex leaves. Most ferns reproduce through the alternation of generations, alternating successive generations of sexual and asexual forms. The sexual form, called the gametophyte or prothallia, is a tiny kidney-shaped plant and difficult to find in the wild. The asexual form, or sporophyte, is represented by the fern plant as it is commonly known.