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

fern A fern (Polypodiopsida or Polypodiophyta ) is a member of a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers. The polypodiophytes include all living pteridophytes exce ...

native to eastern North America and across

Eurasia Eurasia (, ) is the largest continental area on Earth, comprising all of Europe and Asia. Primarily in the Northern and Eastern Hemispheres, it spans from the British Isles and the Iberian Peninsula in the west to the Japanese archipelago ...

. It prefers to grow in marshy situations in full sun. The species epithet ''palustris'' is Latin for "of the marsh" and indicates its common habitat. It is the only known host plant for '' Fagitana littera'', 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