Overview

Distribution

Localities documented in Tropicos sources

Schistidium atrofuscum (Schimp.) Limpr.:
Canada (North America)
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: The Flora of North America outlines that this species is known from Alberta, Canada; New Mexico, United States; and in Eurasia. Reports from Tennessee, United States from 1933 aren't confirmed.

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Physical Description

Morphology

Description

Plants in compact cushions or tufts, dark brown(-olivaceous) or near black. Stems 0.6-2.5 cm, central strand distinct. Leaves usually erect, occasionally slightly curved, sometimes towards stem when dry, ovate-triangular to ovate-lanceolate, moderately keeled distally, 1.2-2.1 mm, with 2-stratose patches or striae or 2-stratose distally; margins weakly recurved to just before the apex, distal half often plane, proximally often more broadly recurved on one side of leaf, 2- or 3-stratose; apices obtuse or sub-acute; costa sub-percurrent or percurrent, rarely excurrent as a tiny awn, smooth; basal marginal cells quadrate with transverse walls sometimes thicker than longitudinal walls; distal laminal cells usually rounded or short-rectangular, 6-9 µm wide, smooth, weakly sinuose. Sexual condition autoicous. Capsule orange- or red-brown, often yellowish, short cylindric or cupulate, 0.75-1 mm; exothecial cells primarily elongate mixed with patches of irregularly angular isodiametric cells, walls sometimes unevenly thickened and curved; stomata absent; peristome patent, very short, 30-100 µm, or rudimentary, orange or orange-red, densely papillose, strongly perforated and unevenly margined. Spores 11-15(-19) µm, granulose or smooth.
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Diagnostic Description

Synonym

Grimmia atrofusca Schimper, Syn. Musc. Eur. ed. 2, 240. 1876
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N2 - Imperiled

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G2 - Imperiled

Reasons: The Flora of North America (2007, vol 27) cites that this species may be the rarest North American species of the genus. However its status in Eurasia isn't known.

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Notes

Comments

Schistidium atrofuscum may be the rarest North American species of the genus. It is characterized by its dark brown or nearly black, compact cushions or tufts, mostly erect, moderately keeled leaves, often 2-stratose distal lamina, and the short or rudimentary, strongly perforated peristome. G. N. Jones (1933) listed this species from Tennessee, but that has not been confirmed.
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Names and Taxonomy

Taxonomy

Comments: Flora of North America (2007, vol 27) treats this taxon as distinct, however the treatment by Anderson et al. considered within Schistidium apocarpum in 1990.

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