Thelypteris palustris var. pubescens (Lawson) Fern. | Species Image Gallery (opens in a new window) |
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TAXONOMY | |||||||||
Family: | Thelypteridaceae | ||||||||
Genus: | Thelypteris | ||||||||
Species Synonyms: | Dryopteris thelypteris auct. non (L.)
Sw. Dryopteris thelypteris var. haleana (Fern.) Broun & Weatherby Dryopteris thelypteris var. pubescens (Lawson) A.R. Prince ex Weatherby Thelypteris confluence var. pubescens (Lawson) Pringle Thelypteris palustris var. haleana Fern. |
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Common Names: | eastern marsh fern marsh fern |
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DISTRIBUTION | |||||||||
Canada: | east-central Saskatchewan – southern Manitoba – southern Ontario – Newfoundland | ||||||||
Saskatchewan: | east-central Saskatchewan; Usherville | ||||||||
Ecoregion: | Boreal Transition | ||||||||
HABITAT | |||||||||
Saskatchewan: | cool, shaded, wet ravines | ||||||||
RARITY STATUS | |||||||||
Provincial
Status According to Harms (2003): |
Endangered |
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Nature Conservancy Status: | G5T5 S1 |
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Saskatchewan
Species at Risk Status: |
None |
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COSEWIC Status: | None |
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Thelypteris palustris var. pubescens is endangered because of extreme rarity in Saskatchewan. This species is regionally restricted and almost always locally sparse. Possible threats have been identified for this species. | |||||||||
SPECIES DESCRIPTION | |||||||||
Rhizomes: | creeping, black, somewhat scaly | ||||||||
Fronds: | solitary, monomorphic or slightly dimorphic, fertile leaves more erect and narrower than sterile leaves, dying back in winter; stipe 9 – 45 cm long, as long as blades, 1 – 3 mm wide, straw-coloured above, black below; scales at base of stipe ovate, tan, glabrous; blade once-pinnate to deeply pinnate-pinnatifed, lanceolate, sterile 10 – 40 cm long, fertile 10 – 75 cm long, veins frequently forked, margins on fertile fronds revolute; rachis not winged | ||||||||
Pinnae: | in 10 – 15 pairs, lower pinnae barely equalling or shorter than the middle ones | ||||||||
Sori: | round, near veins; indusia small, often hairy, tan | ||||||||
Sporangia: | glabrous | ||||||||
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