Overview

Distribution

Localities documented in Tropicos sources

Asplenium septentrionale (L.) Hoffm.:
India (Asia)
Pakistan (Asia)
Russian Federation (Asia)
China (Asia)
Japan (Asia)

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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Ariz., Calif., Colo., D.C., N.Mex., Okla., Oreg., S.Dak., Tex., Utah, W.Va., Wyo.; Mexico in Baja California; Europe; Asia.
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Global Range: Southwestern South Dakota to Arizona and Texas and along the California Sierra Nevada to southwestern Oregon, with a disjunct population in West Virginia.

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Physical Description

Morphology

Description

Roots not proliferous. Stems erect, much branched to produce dense many-stemmed tufts or mats bearing numerous crowded leaves; scales dark reddish brown to black throughout, narrowly deltate, 2--4 × 0.3--0.6 mm, margins entire. Leaves monomorphic. Petiole dark reddish brown proximally, fading to green distally, 2--13 cm, 2--5 times length of blade; indument absent. Blade linear, simple or more often 1-pinnate, 0.5--4 × 0.1--0.4 cm, occasionally wider when pinnae strongly diverge, leathery, glabrous; base acute; apex acute, not rooting at tip. Rachis green, lustrous, glabrous. Pinnae of pinnate leaves 2(--4), strongly ascending to give forked appearance, linear, (5--)10--30 × 0.75--3 mm; base acute; margins remotely lacerate; apex acute. Veins free, obscure. Sori usually 2+ per pinna, parallel to margins. Spores 64 per sporangium. 2 n = 144.
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Diagnostic Description

Synonym

Acrostichum septentrionale Linnaeus, Sp. Pl. 2: 1068. 1753
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Ecology

Habitat

Cliffs of various substrates; 700--2900m.
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Comments: Rocky crevices in the mts.; circumboreal with interrupted distribution.

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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: 21 - 80

Comments: 40-50 EOs currently known (estimate by J. Shevock); may be about that many more again out there. 6 reported in CA.

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Asplenium septentrionale

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


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Statistics of barcoding coverage: Asplenium septentrionale

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 4
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N4 - Apparently Secure

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NatureServe Conservation Status

Rounded Global Status Rank: G4 - Apparently Secure

Reasons: In North America it is mainly a western species with isolated populations in West Virginia; it is found in Europe and Asia also (FNAEC, 1993). No information available about its abundance outside the U.S.

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Threats

Comments: Habitat is high montane and isolated.

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Wikipedia

Asplenium septentrionale

Asplenium septentrionale is a species of fern known by the common names northern spleenwort and forked spleenwort. It is native to western North America, Europe, and Asia, where it grows on rocks. Its long, slender leaves give it a distinctive appearance, more like a grass than a typical fern. Three subspecies exist, corresponding to a tetraploid and a diploid cytotype and their triploid hybrid.

Description[edit]

Asplenium septentrionale is a small fern which grows in dense clusters superficially resembling tufts of grass. The long, dark stems support narrow, leathery leaf blades, which may appear slightly forked at the tip. The fronds are monomorphic, with no difference in shape or size between fertile and sterile fronds.[1]

The rhizome from which the many leaves of each plant spring is about 1 millimetre in diameter, and covered with scales. The scales are narrowly triangular, and range in color from black to a dark reddish-brown. They are 2 to 4 millimetres (0.08 to 0.2 in) long, 0.3 to 0.6 millimetres wide, and entire (untoothed) at the edges. The stipes (stems below the leaf blade) are reddish-brown at the base, fading to green above. They range from 2 to 13 centimetres (0.8 to 5 in) in length, and are about 2 to 5 times the length of the leaf blade itself.[1]

The leaf blades are narrow, with parallel edges following the stem, ranging from 0.5 to 4 centimetres (0.2 to 2 in) in length and 0.1 to 0.4 centimetres (0.04 to 0.2 in) in width. They come to a point at both base and tip, and have a leathery texture. They are often divided into pinnae (leaflets) near the tip, usually two (but sometimes four). These pinnae are sharply angled towards the tip of the blade, giving it a forked appearance. They also come to a point at the tip, and have a few widely spaced, irregular teeth. The rachis (central axis of the leaf) is green and shiny, and the leaves, including the rachis, are free of hairs or scales. Fertile and sterile fronds are the same in appearance; in fertile fronds, the sori are linear, parallel to the edges of the pinna, usually two or more per pinna.[1] The sori are covered by thin, pale tan indusia, with entire edges.[2] It contains 64 spores per sporangium, and most sporophytes have a chromosome number of 2n=144 (a tetraploid).[1]

Fertile leaves of A. septentrionale showing brown sori on underside

Individual plants have an abundant number of leaves, forming dense tufts from a rhizome of about 1 millimetre in diameter, and sometimes mats on flat rocks.[1][2]

A. septentrionale is easily distinguished from other related ferns by its narrow blades, often forked at the tip. The presence of sori on fertile leaves distinguishes it from the vegetative material of a grass or sedge.

Taxonomy[edit]

Originally named Acrostichum septentrionale by Linnaeus in 1753, the species was placed in genus Asplenium by Georg Franz Hoffmann in 1796.[1] In 1980, the discovery of diploid specimens prompted the division of the species into A. septentrionale subsp. septentrionale, the tetraploid population, and A. septentrionale subsp. caucasicum, the diploid population. The diploids are limited to southwest Asia, while the tetraploid population has a circumboreal distribution. The tetraploid subspecies is believed to have arisen from the diploid subspecies by autopolyploidy. The two subspecies are very similar in form, but can be distinguished by the narrower blades of A. septentrionale subsp. caucasicum (to 0.12 centimetres (0.05 in) wide) and its smaller spores (averaging 34 μm in diameter). In 2003, Ronald Viane and Tadeus Reichstein elevated this subspecies to a species, as A. caucasicum, and described a sterile triploid formed by hybridization of the tetraploid and diploid, identifiable by its abortive spores. They designated the hybrid A. ×dirense.[3] However, in his taxonomic revision of Indian pteridophytes, Christopher Fraser-Jenkins reduced all of these taxa to subspecific rank, with the hybrid A. ×dirense becoming the nothosubspecies A. septentrionale subsp. rehmanii.

Asplenium septentrionale can hybridize with maidenhair spleenwort (A. trichomanes) to form the hybrid A. × alternifolium, with A. foreziense to form A. × costei, with black spleenwort (A. adiantum-nigrum) to form A. × contrei, with A. obovatum subsp. lanceolatum to form A. × souchei, and with wall-rue (A. ruta-muraria) to form A. × murbeckii and A. × tavelio. A. × murbeckii can back-cross with A. septentrionale to form A. × hungaricum.

Distribution and habitat[edit]

Asplenium septentrionale subsp. septentrionale is found in Europe and Asia from the Macaronesian Islands east through Europe, western Asia, the former USSR, northern India, parts of western and central China (Xinjiang, Tibet, and Shaanxi), and Taiwan.[3] It is also found in North America, principally in the Rocky Mountains of the western United States, but also in the Black Hills of South Dakota - Wyoming. It also occurs in the mountains of the Cascade Range and the Sierra Nevada, from Oregon south through California into Baja California. Populations occur to the eastward in western Texas and near the tip of the Oklahoma Panhandle, and two very disjunct stations have been located on shale in Monroe County and Hardy County, West Virginia.[1][2]

Asplenium septentrionale subsp. caucasicum has been reported from Georgia, Iran, Pakistan and Turkey. The type specimen of A. septentrionale subsp. rehmanii came from Pakistan, near the Lowari Pass.[3]

Asplenium septentrionale is epipetric and can be found in crevices of rocks, around boulders, and on cliffs.[1][2] It can be found on a variety of substrates,[1] including granitic rocks[2] and limestone.[4] The West Virginia stations are on shale.[2] In the United States, it can be found growing at altitudes from 700 to 2,900 metres (2,300 to 9,500 ft).[1]

Cultivation[edit]

Asplenium septentrionale is hardy to USDA Zone 4. It is best grown in partial sun or medium light in moist to dry potting mix.[4][2] It requires good drainage and little watering. Sensitive to root disturbance, it is difficult to transplant and establish, and is rarely sold by nurseries.[4]

Citations[edit]

References[edit]

  • Hoshizaki, Barbara Joe; Moran, Robbin C. (2001). Fern Grower's Manual. Portland, OR: Timber Press. ISBN 9780881924954. 
  • Lellinger, David B. (1985). A Field Manual of the Ferns & Fern-Allies of the United States & Canada. Washington, DC: Smithsonian Institution Press. ISBN 0874746035. 
  • Viane, Ronald Louis Leo; Reichstein, Tadeus (2003). "Notes on Asplenium of Western Asia". Pteridology in the New Millennium: NBRI Golden Jubilee Volume. Kluwer Academic Publishers. 
  • Wagner, Warren H., Jr.; Moran, Robbin C.; Werth, Charles R. (1993). Asplenium septentrionale. In Flora of North America Editorial Committee. "Flora of North America". Flora of North America North of Mexico 2 (New York and Oxford: Oxford University Press). Retrieved 2012-06-10. 
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Notes

Comments

In North America Asplenium septentrionale is principally a western species with isolated disjunct populations in Monroe and Hardy counties, West Virginia. Because of its close resemblance to a tuft of grass, it is easily overlooked, and discoveries of additional localities are to be expected. In Europe A . septentrionale is known to hybridize with several species, but in North America only the hybrid with A . trichomanes ( A . × alternifolium Wulfen) is known.
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Names and Taxonomy

Taxonomy

Comments: Distinct, inconspicuous, rarely collected.

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