Asplenium exiguum

Beddome

Ferns S. India plate 146. 1864.

Common names: Little spleenwort
Treatment appears in FNA Volume 2.

Roots not proliferous. Stems erect or ascending, unbranched; scales black throughout, narrowly deltate, 2–3 × 0.2–0.3 mm, margins mostly with widely spaced, shallow teeth. Leaves monomorphic. Petiole dark reddish-brown throughout, dull, 1–3 cm, 1/10–1/6 length of blade; indument of black filiform scales. Blade lanceolate, 2-pinnate to 2-pinnate-pinnatifid, 4–10 × 1–3 cm, thin, sparsely pubescent; base tapering; apex acute to acuminate, often bearing minute, scaly, proliferous bud. Rachis basally reddish-brown, fading to green in distal 1/2 to 3/4, dull, sparsely pubescent and with a few filiform scales. Pinnae 10–20 pairs, narrow, oblong; medial pinnae 5–12 × 4–7 mm; base acute to obtuse; margins coarsely incised; apex notched, bearing proliferous bud. Veins free, obscure. Sori 1–4 pairs per pinna, on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2n = 72.


Habitat: Cliffs
Elevation: 1200 m

Distribution

V2 81-distribution-map.gif

Ariz., Mexico, Asia in the Himalayas, Pacific Islands in the Philippines

Discussion

Asplenium exiguum has an interesting disjunct distribution, its range barely extending into the United States. Its vegetative propagation by buds scattered on the blade was reported by J. T. Mickel (1976).

Selected References

None.

Lower Taxa

None.
... more about "Asplenium exiguum"
Notched (?) +, Acute (?) +  and Acuminate (?) +
Warren H. Wagner Jr. +, Robbin C. Moran +  and Charles R. Werth +
Beddome +
acute +  and obtuse +
simple +  and 4-pinnate +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
2-pinnate;2-pinnate-pinnatifid +
thin;1cm;3cm +
proliferous +
minute +
Little spleenwort +
Ariz. +, Mexico +, Asia in the Himalayas +  and Pacific Islands in the Philippines +
1200 m +
Cliffs +
monomorphic +
fertile +  and than sterile ones +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
perforate +, reticulate +, spiny +  and winged +
not articulate +
dark reddish-brown +
1/10 length of blade;1/6 length of blade +
c--shaped +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
10 (?) +  and 20 (?) +
Ferns S. India +
fading +  and green +
not proliferous +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
filiform +  and deltate +
0.2mm;0.3mm +
acroscopic +  and basiscopic +
less lunate;linear +
dorsiventral +  and symmetric +
ascending +  and erect +
Asplenium exiguum +
Asplenium +
species +
shallow +
anastomosing +