Asplenium auritum

Swartz

J. Bot. (Schrader) 1800(2): 52. 1801.

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

Roots proliferous. Stems erect, unbranched; scales brown throughout, broadly linear, 1–2 × 0.7–1.1 mm, margins shallowly and widely dentate. Leaves monomorphic. Petiole green to black, dull, 2–10 (–12) cm, 1/3–1/2 length of blade; indument absent. Blade narrowly deltate, 1–2-pinnate, 4–20 (–30) × 1.8–12 (–18) cm, thick, nearly glabrous; base not tapered; apex gradually tapered, not rooting. Rachis green to black, dull, abaxially glabrous. Pinnae in 10–22 pairs, linear-deltate, medial pinnae 1–4 (–9) × 0.3–1 (–2.5) cm; base with acroscopic auricle or pinnule enlarged, excavated in proximal 1/5–1/4; margins mostly 1–2-dentate-serrate, or lobed or pinnate proximally or in proximal 2/3; apex blunt in some 1-pinnate forms, gradually reduced to attenuate in strongly 2-pinnate forms; pinnules narrow, not auriculate. Veins free, evident. Sori 4–9 (–10) pairs per pinna, subcostal, nearly parallel to costae on both basiscopic and acroscopic sides. Spores 64 per sporangium.


Habitat: Mainly epiphytic on old sloping tree trunks in shady forests
Elevation: 0–50 m

Distribution

V2 421-distribution-map.gif

Fla., Mexico, West Indies in the Antilles, Central America, South America

Discussion

In the flora Asplenium auritum is evidently confined to Florida, where it is rare, occurring primarily on live oaks (Quercus virginiana Miller). The species is highly variable. Juvenile plants, less than 2 cm, tend to be 2-pinnate. In mature plants all stages between 1-pinnate and 2-pinnate leaves are found, but 1-pinnate are more common.

Selected References

None.

Lower Taxa

None.
... more about "Asplenium auritum"
not rooting +
Attenuate (?) +, Blunt (?) +  and Tapered (?) +
reduced +
Warren H. Wagner Jr. +, Robbin C. Moran +  and Charles R. Werth +
Swartz +
not tapered +
simple +  and 4-pinnate +
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
12 cm120 mm <br />0.12 m <br /> (18 cm180 mm <br />0.18 m <br />) +
4 cm40 mm <br />0.04 m <br /> (20 cm200 mm <br />0.2 m <br />) +
deltate +
thick;1.8cm;12cm +
Eared spleenwort +
Fla. +, Mexico +, West Indies in the Antilles +, Central America +  and South America +
0–50 m +
2-pinnate +  and 1-pinnate +
Mainly epiphytic on old sloping tree trunks in shady forests +
monomorphic +
fertile +  and than sterile ones +
in proximal 2/3 +, pinnate +, lobed +  and 1-2-dentate-serrate +
4 cm40 mm <br />0.04 m <br /> (9 cm90 mm <br />0.09 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
perforate +, reticulate +, spiny +  and winged +
not articulate +
10 cm100 mm <br />0.1 m <br /> (12 cm120 mm <br />0.12 m <br />) +
green +  and black +
1/3 length of blade;1/2 length of blade +
c--shaped +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
not auriculate +
enlarged +
J. Bot. (Schrader) +
green +  and black +
proliferous +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.7mm;1.1mm +
acroscopic +  and basiscopic +
less lunate;linear +
dorsiventral +  and symmetric +
Asplenium auritum +
Asplenium +
species +
anastomosing +