|
|
|
|
|
|
|
|
|
|
|
| Thelypteris palustris var. pubescens (Lawson) Fern. | Species Image Gallery (opens in a new window) |
||||||||
| 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. |
||||||||
| Common Names: | eastern marsh fern marsh fern |
||||||||
| 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 |
||||||||
| Nature Conservancy Status: | G5T5 S1 |
||||||||
| Saskatchewan
Species at Risk Status: |
None |
||||||||
| COSEWIC Status: | None |
||||||||
| 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 | ||||||||
| |||||||||
