Class Filicopsida are commonly known as ferns. They are a diverse group of plants that have been around for millions of years. Synonyms for this class include Polypodiopsida, Filicinae, and Pteridophyta. These names are derived from different characteristics of the ferns. Polypodiopsida means "many-footed" and refers to the numerous roots that ferns have. Filicinae means "fern-like" and Pteridophyta means "feather plant". These synonyms demonstrate the beauty and complexity of ferns. Ferns can be found in many different environments and have many different uses. Some ferns are used for medicinal purposes, while others are used as food or for decoration.