Class Filicinae is a scientific term used to describe a group of plants that are commonly known as ferns. These plants are characterized by their feather-like leaves, which are usually found in moist, shady environments. However, there are a number of synonyms for the term Class Filicinae, including Pteridophyta, which is often used in botanical classifications. Other synonyms include Tracheophyta, which refers to all vascular plants, and Embryophyta, which describes all plants that use seeds for reproduction. Regardless of the term used, ferns are an important part of the natural world, providing habitats and food for a wide range of animals and insects.