Overview

Distribution

National Distribution

Canada

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Distribution: widely distributed in the world.
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Physical Description

Morphology

Description

Plants to 11 × 3.5 mm. Stem mostly branched; axillary hyaline nodules absent; central strand present. Leaves as many as 15 pairs, often undulate, oblong to lanceolate, obtuse to broadly acute, cuspidate, to 2.7 mm × 0.6 mm; dorsal lamina truncate-rounded proximally, ending at insertion, not decurrent; vaginant laminae 2/3 the leaf length, ± equal, minor lamina ending on or near margin; margin evenly serrulate, often crenulate-serrulate on dorsal and ventral laminae, elimbate; costa ending in cuspidate apex, taxifolius-type; laminal cells 1-stratose, distinct, smooth, bulging, firm-walled, irregularly hexagonal, 8-11 µm frequently paler at margin, conspicuously mammillose in vaginant laminae, larger and clearer juxtacostally. Sexual condition rhizautoicous; perigonia on short branches proximal to elongate stems; perichaetia on short, proximal, axillary branches. Sporophytes 1 per perichaetium. Seta to 17 mm. Capsule theca slightly inclined, slightly arcuate, bilaterally symmetric, to 1.5 mm; peristome taxifolius-type; operculum to 1 mm. Calyptra cucullate, smooth, to 2 mm. Spores 13-18 µm.
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Description

Plants medium-sized, growing in dense tufts. Leafy stems simple, occasionally branched, 4.5–16.0 mm long, 2.0–4.6 mm wide; axillary hyaline nodules not developed; cortical stem-cells small and thick-walled, central strand not well developed. Leaves in 6–17 pairs, more or less overlapping, middle to upper leaves ovate-lanceolate, 1.6–3.3 mm × 0.5–0.8 mm, acute to mucronate at apex; base of dorsal laminae usually rounded, sometimes broadly wedge-shaped; vaginant laminae 1/2 –3/5 the leaf length, slightly unequal; costa stout, percurrent to shortly excurrent; margins serrulate; cells of apical and dorsal laminae rounded-hexagonal to hexagonal, 7–11 µm long, thin-walled, mammillose, obscure; cells of vaginant laminae similar to those of apical and dorsal laminae, but with thicker walls and higher mammillae, larger toward the base near costa. Dioicous. Female inflorescences lateral. Perichaetial leaves differentiated, narrowly lanceolate, ca. 1.3 mm long. Archegonia 370–426 µm long. Setae 11–16 mm long; capsules horizontal to inclined, asymmetrical, curved, constricted below capsule mouth when dry; urns ca. 1 mm long; exothecial cells rectangular-hexagonal, with thickened longitudinal and thin transverse walls; opercula long rostrate; peristome teeth 0.56–0.63 mm long, 127–156 µm wide at base, with distinct projections on the articulations. Spores 10–18 µm in diameter.
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Diagnostic Description

Synonym

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Synonym

Fissidens sylvaticus Griff., Calcutta J. Nat. Hist. 2: 507. 1842.
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Ecology

Habitat

Habitat: on soil, rarely on rocks.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Fissidens taxifolius

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Fissidens taxifolius

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 4
Specimens with Barcodes: 5
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNR - Unranked

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Notes

Comments

Fissidens taxifolius is distinguished by evenly serrulate or crenulate-serrulate leaf margin, stout costa ending in leaf cusp, conspicuous mammillose cells in the vaginant laminae, and sporophytes on short branches in the axils of proximal leaves. It can be confused with F. bushii, but that species is smaller, has costa shorter, and cells in the vaginant laminae have small, more or less inconspicuous papillae in the corners of the walls. Fissidens taxifolius usually occurs on shaded, damp soil or humus, whereas F. bushii is usually found on disturbed soil in woods, along paths, and in road cuts. Fissidens clebschii is considered to be a freakish expression of F. taxifolius (R. A. Pursell 2003).
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Comments

Fissidens taxifolius is characterized by its highly mammillose cells of the vaginant laminae.
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