Thelypteris palustrisSchott

marsh fern

WFO wfo-0001107441 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Thelypteris palustris, photographed by Ryan Sorrells
fig. a Ryan Sorrells, CC BY 4.0 / 2022-06-11 / obs. 205628530
Thelypteris palustris, photographed by Ryan Sorrells
fig. b Ryan Sorrells, CC BY 4.0 / obs. 205674883
Thelypteris palustris, photographed by Марина Садыкова
fig. c Марина Садыкова, CC BY 4.0 / obs. 203241365
Thelypteris palustris, photographed by Евгений Егорейченков
fig. d Евгений Егорейченков, CC BY 4.0 / obs. 201807870
Thelypteris palustris, photographed by Lynn Harper
fig. e Lynn Harper, CC0 1.0 / obs. 205875850
Thelypteris palustris, photographed by Oleksii Vasyliuk
fig. f Oleksii Vasyliuk, CC BY 4.0 / obs. 157637849
Thelypteris palustris, photographed by Lynn Harper
fig. g Lynn Harper, CC0 1.0 / obs. 158223550
Thelypteris palustris, photographed by Steven Lamonde
fig. h Steven Lamonde, CC BY 4.0 / obs. 160634316

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Confused withby our own model

These are not lookalikes we guessed at. Each one is a species our identification model genuinely mistook for this plant, and how many times. The error rate is published.

Also published as 65 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Acrostichum thelypteris L.
  • Aspidium palustre Gray
  • Aspidium thelypteris (L.) Sw.
  • Aspidium thelypteris f. incisum (Asch.) Werner Christ.
  • Aspidium thelypteris f. pufferae (A.A.Eaton) B.L.Rob.
  • Aspidium thelypteris f. rogoetzianum (Bolle) Werner Christ.
  • Aspidium thelypteris var. incisum Asch.
  • Aspidium thelypteris var. rogoetzianum Bolle
  • Athyrium thelypteris (L.) Spreng.
  • Dryopteris thelypteris (L.) A.Gray
  • Dryopteris thelypteris f. haleana (Fernald) C.F.Reed
  • Dryopteris thelypteris f. linearis (Farw.) M.Broun
  • Dryopteris thelypteris f. pufferae (A.A.Eaton) A.Prince ex Weath.
  • Dryopteris thelypteris f. suaveolens (Clute) A.Prince ex Weath.
  • Dryopteris thelypteris subsp. pubescens (G.Lawson) Hultén
  • Dryopteris thelypteris var. haleana (Fernald) M.Broun ex Weath.
  • Dryopteris thelypteris var. koreana Nakai
  • Dryopteris thelypteris var. pubescens (G.Lawson) Nakai
  • Dryopteris thelypteris var. pubescens (G.Lawson) A.Prince
  • Dryopteris tremula Christ
  • Filix thelypteris Farw.
  • Filix thelypteris (L.) Farw.
  • Filix thelypteris f. frondosa Farw.
  • Filix thelypteris var. linearis Farw.

and 41 more.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.

We publish what we can source and we say so when we cannot. This page has no care advice, no toxicity claim and no native range, because we do not yet have those from a source we can cite.