Overview

Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Norway, Greenland, Northwest Territories, Siberia (Flatberg and Frisvoll 1984). Québec, Yukon, Alaska, Eurasia (Flora of North America 2007).

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Physical Description

Morphology

Description

Plants moderately robust, capitulum distinct and flat-topped; golden brown, brown or dark-brown, less commonly variegated green and brown, without metallic luster when dry. Stems pale to yellowish brown; most superficial cortical cells aporose, but a few with a single oval pore at the distal end of the cell. Stem leaves narrowly to broadly lingulate or sometimes lingulate-spatulate, (1.1-)1.2-1.4(-1.6) mm; apex broadly obtuse to obtuse-truncate and more or less fimbriate-lacerately resorbed, border in distal half narrow and often indistinct, in proximal half widened and filling up 1/3-1/2(-2/3) of the breadth at the base; hyaline cells broadly S-shaped to rhombic S-shaped, predominantly nonseptate but a few cells are 1-3-septate; efibrillose. Branches unranked, terete. Branch fascicles with 2 spreading and 1 pendent branch. Branch leaves broadly lanceolate to ovate-lanceolate, (1.1-)1.4-1.8(-2.1) mm, slightly concave, straight to slightly subsecund; apex involute; border entire; hyaline cells on convex surface with (5-)8-10(-12) semicircular to elliptical, ringed pores along the commissures, concave surface aporose or infrequently with 1-2 pores per cell in the distal portion of the cell, more numerous along leaf margins. Sexual condition unknown. Spores not seen.
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Ecology

Habitat

Comments: Grows at the edge of hummocks in tundra health mire vegetation (Flatberg and Frisvoll 1984).

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 1 - 5

Comments: Known from four or five localities (Flatberg and Frisvoll 1984).

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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N1 - Critically Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

Reasons: This golden brown to brownish moss is known from Norway, Greenland, Siberia, the Northwest Territories, Québec, Yukon, and Alaska.

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Notes

Comments

Sporophytes are uncommon in Sphagnum arcticum. All collections of this fairly common species have been made north of 59° N latitude in wet or moist tundra vegetation. In its typical dark brown color, this species is often quite distinctive in the field. Sphagnum fuscum is smaller, not as dark, and its stem leaves are not as truncate-lacerate. Sphagnum subfulvum has a glossy sheen, which S. arcticum lacks, and its stem leaf has an obtuse but not lacerate apex.
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