Asplenium trichomanes-dentatum

Linnaeus

Sp. Pl. 2: 1080. 1753.

Synonyms: Asplenium dentatum Linnaeus
Treatment appears in FNA Volume 2.

Roots proliferous. Stems erect, unbranched; scales blackish throughout, linear, 0.9–1.1 × 0.2–0.3 mm, margins entire. Leaves dimorphic; sterile leaves short with small crowded pinnae; fertile leaves 9–20 cm with long, widely spaced pinnae. Petiole pale green except darkish proximally, dull, (1–) 4–6 (–10) cm, 1/5–1/2 length of blade; indument absent. Blade linear, 1-pinnate, 3–10 (–15) × 1–2.5 cm, papery, slightly glandular; base not tapered; apex with elongate terminal pinna similar in size to subtending lateral pinnae, not rooting. Rachis green throughout, dull, glabrous. Pinnae in 5–8 (–12) pairs, ovate, strongly asymmetric, lanceolate; medial pinnae 3–11 × (2–) 4–6 mm; base acute; margins crenate-dentate; apex truncate. Veins free, somewhat evident. Sori (1–) 2–5 (–8), mostly on acroscopic side. Spores 64 per sporangium. 2n = 108.


Habitat: Shady hammocks, on walls of limesinks, moist limestone rocks, rocky banks of streams
Elevation: 0–50 m

Distribution

V2 726-distribution-map.gif

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

Discussion

In the flora Asplenium trichomanes-dentatum is known only from shady hammocks in extreme southern peninsular Florida, where it grows in colonies. This delicate spleenwort should be studied in detail and compared with its similar and apparently conspecific counterparts in tropical America.

Selected References

None.

Lower Taxa

None.
not rooting +
Warren H. Wagner Jr. +, Robbin C. Moran +  and Charles R. Werth +
Linnaeus +
acute +  and not tapered +
simple +  and 4-pinnate +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
1cm;2.5cm +
Fla. +, s Mexico +, West Indies in the Antilles +, Central America +, South America in Colombia +  and Venezuela +
0–50 m +
Shady hammocks, on walls of limesinks, moist limestone rocks, rocky banks of streams +
monomorphic +
fertile +  and sterile +
9 cm90 mm <br />0.09 m <br /> (20 cm200 mm <br />0.2 m <br />) +
crenate-dentate +  and entire +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
perforate +, reticulate +, spiny +  and winged +
not articulate +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
pale green except darkish +
1/5 length of blade;1/2 length of blade +
c--shaped +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
proliferous +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
0.2mm;0.3mm +
less lunate;linear +
dorsiventral +  and symmetric +
Asplenium dentatum +
Asplenium trichomanes-dentatum +
Asplenium +
species +
anastomosing +