''Thelypteris palustris'', the marsh fern, or eastern marsh fern, is a species of fern native to eastern

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

and across Eurasia. It prefers to grow in marshy situations in full sun. The species

epithet An epithet (, ), also byname, is a descriptive term (word or phrase) known for accompanying or occurring in place of a name and having entered common usage. It has various shades of meaning when applied to seemingly real or fictitious people, di ...

''palustris'' is Latin for "of the marsh" and indicates its common habitat. It is the only known host plant for ''

Fagitana littera ''Fagitana littera'', the marsh fern moth, is a moth of the family Noctuidae. It is listed as a species of special concern in the US state of Connecticut. It was described by Achille Guenée in 1852. Larval foods ''Thelypteris palustris ''The ...

'', the marsh fern moth.Pocketguide to Eastern Wetlands By T. Travis, Shanda Brown p.57, 2014

Subtaxa

The following subspecies are accepted: *''Thelypteris palustris'' subsp. ''palustris'' *''Thelypteris palustris'' subsp. ''pubescens''

References

Thelypteridaceae Ferns of the Americas Ferns of Asia Ferns of Europe Flora of Asia Flora of Europe Plants described in 1821 {{Polypodiales-stub