Thelypteris palustris var. pubescens (Lawson) Fern.
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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.
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
 
THELYPTERIDACEAE KEY FOR SPECIES FOUND IN SASKATCHEWAN
 
1 Blades once-pinnate to deeply pinnate-pinnatifed, rachis not winged; fronds lanceolate, the lower pinnae barely equalling or shorter than the middle ones; sporangia not spiny
Thelypteris palustris var. pubens
1 Blades twice pinnatifed, pinnae on upper part of blade connected by winged rachis; fronds deltoid, the lowest pinnae longer than middle and upper ones; sporangia spiny
Phegopteris connectilis