Ferns ([i]Polypodiopsida[/i] or [i]Polypodiophyta[/i]) are a group of flowerless and seedless [[plant]]s. They do not have fronds and roots, and reproduce via spores. Their foliage formation is triangular.

h4. External links

* "Wikipedia: Fern":[http://en.wikipedia.org/wiki/Fern]
羊歯 シダ シダ植物