Thelypteris palustris pubescens is a species of fern that is native to marshy areas of North America. It is commonly known as the "marsh fern," but it also goes by a number of other common names, including hairy marsh fern, woolly marsh fern, and swamp shield fern. These synonyms refer to the fern's physical characteristics, specifically the fine hairs that cover its fronds. Other synonyms include "Norway swamp fern," "bushy swamp fern," "downy swamp fern," and "soft jungle fern." Despite the variety of names, all refer to the same species of fern, which grows in wetlands, swamps, and marshes throughout North America.