Species: Gymnocarpium jessoense ssp. parvulum Sarvela

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Gymnocarpium jessoense ssp. parvulum Sarvela

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TAXONOMY

Family:

Dryopteridaceae

Genus:

Gymnocarpium

Species Synonyms:

none

Common Names:

limestone oak-fern
asian oakfern

DISTRIBUTION

Canada:

Yukon Territory – Mackenzie District – northern British Columbia – northern Saskatchewan – Ontario, eastern Quebec – New Brunswick

Saskatchewan:

northern Saskatchewan; Lake Athabasca – Hasbala Lake – Deschambault Lake

Ecoregion:

Athabasca Plain, Churchill River Upland, Tazin Lake Upland, Selwyn Lake Upland

HABITAT

Saskatchewan:

woods, on granitic slopes and outcrops

RARITY STATUS

Provincial Status According
to Harms (2003):

Vulnerable

Nature Conservancy Status:

G5T4 S2S3

Saskatchewan Species at
Risk Status:

None

COSEWIC Status:

None

Limestone oak-fern is vulnerable in Saskatchewan because it is rare or uncommon. Local population sizes vary. No immediate threats are known for this species.

SPECIES DESCRIPTION

Roots:

rhizome slender, creeping, blackish; scales 1 – 4 mm

Fronds:

fertile and sterile fronds similar in appearance, scattered

Stipes:

5 – 25 cm, longer than blade, slender, straw-coloured, base dark, dull, glandular; scales 2 – 6 mm

Blades:

3 – 14 cm long, broadly triangular or 5-sided in outline, bipinnate-lobed to tripinnate-lobed, firm, glandular on both sides

Pinnae:

jointed to rachis, long stalked, two lowest pinnae half as long as terminal one, 2 – 9 cm long, strongly curved towards tip of leaf; veins forked, reaching margin

Pinnules:

tip obtuse

Indusia:

absent

Sori:

rounded

GYMNOCARPIUM KEY FOR SPECIES FOUND IN SASKATCHEWAN

1 Small, blackish malformed spores and large brown round spores; moderately glandular on lower surface	G. X intermedium
1 Spores all brownish; either densely glandular or essentially hairless on lower surface	2

2 Central axis and frond glandular below, blade firm, two lowest blade divisions 1/2 as long as terminal one; stalk and central axis dull	G. jessoense var. parvulum
2 Central axis and frond glabrous below, blade delicate; two lowest blade divisions nearly as long as terminal one; stalk and central axis shiny	G. dryopteris