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(First upload on August 20 2012. Last on February 28 2024) [ 日本語 | English ]

Thelypteris Schmidel (ヒメシダ) T. palustris (Salisb.) Schott adopted by: 岩槻 1992, 中池 1992, 海老原 2016 Himeshida (ヒメシダ, 姫羊歯), marsh fern Syorima (ショリマ) Lifeform: long-rhizomatous, summergreen fern Distribution: temperate regions, including Japan Habitat: wetlands, grassy marshlands, streamsides, etc. Leaf: dimorphic, 40-80 cm long sterile frond fertile frond: slim, leaf length ≈ 30 cm long Leaf stalk (petiole): 20-40 cm long Lateral vein: dichotomous and hairless (number of veins, 中軸分岐数)

Chromosome number: n= 35, or 36, 2n = 70 (diploid) Synonyms: Acrostichum thelypteris L. Dryopteris thelypteris A. Gray (牧野 1977) Lastrea thelypteris (L.) Bory, adopted by (田川 1959) Polypodium palustre Salisb. Thelypteris thelypteroides (Michx.) Holub Thelypteris palustris (Salisb.) Schott ssp. pubescens (G. Lawson) Fraser-Jenk. Thelypteris confluens (Thunb.) C. V. Morton, recently used f. pubescens (G. Lawson) Clute (ヒメシダ, s.s.) f. palustris (ハダカヒメシダ), hairless

Thelypteris palustris in Hokkaido

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f. pubescens

1 2 3
4 5 6
7 8 9
[1] at Abiragawa fen on July 16 2012. [2] in Shizukari wetland, southern Hokkaido, on June 15 2015. [3-5] along a walkboard to go Mokeuni Pond, Sarufutsu Village, northern Hokkaido, on August 27 2015. [6] along the shore of Echigo Pond in Ebetsu City on October 8 2017. [7] along the Horonai River in the Tomakomai Experimental Forest of HU on June 27 2023. [8/9] in Tomakomai Experimental Forest, used for observing succession, on September 14 2017.

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Specimens kept in SAPS

1 2 3
[1-3] along a paved road in Utasai wetland, southern Hokkaido, on August 28 2018.

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Specimens kept in BO

1 2 3
[1-3] at the Bogor Herbarium (Cibinong Branch), Indonesia, on October 25 2023. The labels are Dryopteris thelypteris and Nephrodium thelypteris on [1], Dryopteris thelypteris and Aspidium thelypteris on [2/3].