Asplenium pumilum

Swartz

Prodr. 129. 1788.

Common names: Triangle spleenwort hairy spleenwort
Synonyms: Asplenium pumilum var. anthriscifolium (Jacquin) Wherry
Treatment appears in FNA Volume 2.

Roots proliferous. Stems erect, unbranched; scales black with pale margins, linear, extremely narrow, 2–3 mm, only several cells wide. Leaves monomorphic. Petiole green in small leaves, black abaxially and green adaxially in large leaves, (1–) 2–7 (–16) cm, 1–2 times length of blade; indument of fine, nonglandular hairs on veins. Blade deltate, simple to 2-pinnate, 1–8 (–12) × 1–6 (–8) cm, thin, papery with scattered hairs on both surfaces; base truncate; margins crenate-dentate; apex pointed, not rooting. Rachis green, dull, glabrous. Pinnae in 0–5 pairs, ovate to deltate, simple to lobed to pinnate proximally, 1–6 × 1–3.5 cm, proximal pinna pair largest; base broadly cuneate to truncate; margins irregularly crenate; apex rounded to pointed. Veins free, evident. Sori 1–15 (–35) per pinna, on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2n = 72.


Habitat: Shaded limestone boulders
Elevation: 0–50 m

Distribution

V2 822-distribution-map.gif

Fla., Mexico, West Indies, Central America, South America

Discussion

Asplenium pumilum is a widespread tropical American fern known only from a few spots in north central Florida. It is a very distinct species, readily recognized by its hairy blades and deltate leaves. Fertile forms vary from simple and only 2 cm to 2-pinnate and 28 cm, and all stages between the two extremes exist. Extreme forms are different enough to suggest that two species might be present.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Asplenium pumilum"
not rooting +
Rounded (?) +  and Pointed (?) +
Warren H. Wagner Jr. +, Robbin C. Moran +  and Charles R. Werth +
Swartz +
broadly cuneate +  and truncate +
simple +  and 2-pinnate +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
1 cm10 mm <br />0.01 m <br /> (8 cm80 mm <br />0.08 m <br />) +
deltate +
thin;1cm;6cm +
Triangle spleenwort +  and hairy spleenwort +
Fla. +, Mexico +, West Indies +, Central America +  and South America +
0–50 m +
Shaded limestone boulders +
monomorphic +
fertile +  and than sterile ones +
large +  and small +
perforate +, reticulate +, spiny +  and winged +
not articulate +
7 cm70 mm <br />0.07 m <br /> (16 cm160 mm <br />0.16 m <br />) +
green +  and black +
1-2 times length of blade +
c--shaped +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
lobed;pinnate +
proliferous +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
acroscopic +  and basiscopic +
less lunate;linear +
dorsiventral +  and symmetric +
Asplenium pumilum var. anthriscifolium +
Asplenium pumilum +
Asplenium +
species +
anastomosing +