Family Blechnaceae is a group of ferns commonly known as the bracken fern family. These ferns are characterized by their large fronds, which can reach up to six feet in height. Some common synonyms for Family Blechnaceae include the Pteridaceae family and the Polypodiaceae family. Both of these families are known for their ferns, and share many similarities with the bracken fern family. Other related synonyms include the Pteridophyta division, the fern division, and the fern group. All of these terms are used to describe a wide range of ferns, including those in the Blechnaceae family.