Genus Gymnocarpium is a group of ferns that belongs to the family of Dryopteridaceae. This genus is also known by various synonyms such as Phegopteris, Coenopteris, Lastrea, and Thelypteris. Gymnocarpium is a small genus that consists of only around 15 species of ferns that are widely distributed across the Northern Hemisphere. These ferns are commonly known as oak ferns, referring to their preference for growing in the shade of deciduous trees such as oaks. The Gymnocarpium ferns are characterized by their delicate and frilly fronds, which are highly sought after by plant enthusiasts. Overall, the different synonyms for the genus Gymnocarpium add to its diverse and interesting history in botany.