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Asplenium septentrionale (Linnaeus) Hoffmann
FORKED SPLEENWORT FERN
Forked spleenwort

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Asplenium septentrionale, entire
© George Yatskievych, 2006-2011 · 1
Asplenium septentrionale, entire

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Asplenium septentrionale, sporangia
© George Yatskievych, 2006-2011 · 1
Asplenium septentrionale, sporangia
Asplenium septentrionale
© George Yatskievych, 2003 · 1
Asplenium septentrionale

Associates · map
FamilyScientific name @ source (records)
Melampsoraceae  Melampsora feurichii @ BPI (1)
Mycosphaerellaceae  Mycosphaerella asplenii @ BPI (6)
Pleosporaceae  Pleospora asplenii @ 627290A (1); 627290B (1); 627290C (1)
Pucciniastraceae  Milesina feurichii @ BPI (5)
Syrphidae  Milesia feurichii @ BPI (12)

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FNA | Family List | FNA Vol. 2 | Aspleniaceae | Asplenium

7. Asplenium septentrionale (Linnaeus) Hoffmann, Deutschl. Fl. 2: 12. 1796.

Forked spleenwort

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

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.

Cliffs of various substrates; 700--2900 m; Ariz., Calif., Colo., D.C., N.Mex., Okla., Oreg., S.Dak., Tex., Utah, W.Va., Wyo.; Mexico in Baja California; Europe; Asia.

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.

Updated: 2020-12-02 03:49:15 gmt
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