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Lobed Spleenwort

Asplenium pinnatifidum Nutt.

Comments

provided by eFloras
Asplenium pinnatifidum is an allotetraploid derived from the hybrid A . montanum × rhizophyllum . Although isozyme studies indicate that this species originated at more than one site (C. R. Werth et al. 1985b), the sterile diploid hybrid is unknown. The species is uncommon in the eastern part of the Appalachian region and becomes much more frequent in the Cumberland and Interior Low plateaus, extending westward into the Ozarks and Ouachitas. It is disjunct in the Driftless Area of Wisconsin in Iowa County (M. G. and R. P. Hanson 1979). It crosses frequently with A . montanum (producing A . × trudellii Wherry), with A . bradleyi (producing A . × gravesii Maxon), with A . platyneuron (producing A . × kentuckiense McCoy), and with A . trichomanes (producing A . × herb-wagneri W. C. Taylor & Mohlenbrock).
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
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eFloras

Description

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Roots not proliferous. Stems short-creeping to erect, frequently branched; scales dark reddish brown, narrowly deltate, 3--5 × 0.3--0.5 mm, margins entire. Leaves monomorphic. Petiole dark reddish brown at base, fading to green in distal 1/3--1/2, lustrous, 1--10 cm, 1/5--1 times length of blade; indument of dark reddish brown, narrowly deltate scales at very base, grading distally into hairs. Blade narrowly deltate, often irregular in outline, pinnatifid or often with single pair of pinnae proximally, 2--17(--20) × 1--4(--13) cm, thick, pubescent abaxially only; base truncate, cordate, or auriculate; apex acute to long-attenuate, proliferous bud very rare, not known to root in nature. Rachis green, sometimes drying to tan, dull; hairs on abaxial surface only, scattered, minute. Pinnae 0--1 pair, ovate to deltate, sometimes narrowly so, 5--20(--90) × 0.4--1(--1.2) mm; base truncate to acute; margins crenate to serrate; apex rounded to attenuate. Veins free (rarely anastomosing), obscure. Sori 1--6(--40+) per segment, usually confluent with age. Spores 64 per sporangium. 2 n = 144.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Distribution

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Ala., Ark., D.C., Ga., Ill., Ind., Ky., Md., Miss., Mo., N.J., N.C., Ohio, Okla., Pa., S.C., Tenn., Va., W.Va., Wis.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Habitat

provided by eFloras
Cliffs, ledges, and boulders of sandstone and other acidic rocks; 0--1000m.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Synonym

provided by eFloras
Asplenosorus pinnatifidus (Nuttall) Mickel
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras