Asplenium septentrionale

(Linnaeus) Hoffmann

Deutschl. Fl. 2: 12. 1796.

Common names: Forked spleenwort
Basionyms: Acrostichum septentrionale Linnaeus Sp. Pl. 2: 1068. 1753
Treatment appears in FNA Volume 2.

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. 2n = 144.


Habitat: Cliffs of various substrates
Elevation: 700–2900 m

Distribution

V2 229-distribution-map.gif

Ariz., Calif., Colo., D.C., N.Mex., Okla., Oreg., S.Dak., Tex., Utah, W.Va., Wyo., Mexico in Baja California, Europe, Asia

Discussion

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.

Selected References

None.

Lower Taxa

None.

... more about "Asplenium septentrionale"
not rooting +
Warren H. Wagner Jr. +, Robbin C. Moran +  and Charles R. Werth +
(Linnaeus) Hoffmann +
Acrostichum septentrionale +
0.5 cm5 mm <br />0.005 m <br /> (4 cm40 mm <br />0.04 m <br />) +
wider;0.1cm;0.4cm +
Forked spleenwort +
Ariz. +, Calif. +, Colo. +, D.C. +, N.Mex. +, Okla. +, Oreg. +, S.Dak. +, Tex. +, Utah +, W.Va. +, Wyo. +, Mexico in Baja California +, Europe +  and Asia +
700–2900 m +
Cliffs of various substrates +
monomorphic +
2 (?) +  and Numerous (?) +
fertile +  and than sterile ones +
lacerate +
many-stemmed +
perforate +, reticulate +, spiny +  and winged +
not articulate +
fading +  and green +
2-5 times length of blade +
c--shaped +
2 cm20 mm <br />0.02 m <br /> (13 cm130 mm <br />0.13 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.075 cm0.75 mm <br />7.5e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Deutschl. Fl. +
not proliferous +
dark reddish-brown +  and black +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
deltate +
0.3mm;0.6mm +
less lunate;linear +
dorsiventral +  and symmetric +
Asplenium septentrionale +
Asplenium +
species +
many-stemmed +
anastomosing +