The Northern Beech Fern, also known as the Thelypteris phegopteris, is a species of fern that grows in the northern hemisphere. It is a unique and ornamental plant that is popular among gardeners and botanists alike. In addition to its common name, there are several synonyms used to refer to this fern species. Some of the synonyms for the Northern Beech Fern include the Oak Fern, the Beech Fern, and the Mountain Fern. Each name highlights a different aspect of the fern's unique qualities, such as its preferred habitat or physical appearance. Regardless of the name used, this fern remains a beloved addition to any garden or natural landscape.