Asplenium heterochroum

Kunze

Linnaea 9: 67. 1834.

Common names: Varicolored spleenwort
Synonyms: Asplenium muticum Gilbert
Treatment appears in FNA Volume 2.

Roots not proliferous. Stems erect or ascending, rarely branched; scales black throughout, linear-lanceolate, 2–3 × 0.2–0.4 mm, margin entire, apex attenuate. Leaves monomorphic. Petiole black or purplish black throughout, lustrous, 0.3–5 cm, 1/4–1/15 length of blade; indument of black filiform scales at base. Blade linear or narrowly oblanceolate, 1-pinnate throughout, 6–22 (–37) × 1–1.8 (–2.3) cm, thin, glabrous; base tapered; apex acute, not rooting. Rachis black throughout, lustrous, glabrous. Pinnae in 15–40 pairs, oblong; medial pinnae somewhat asymmetric, oblong, 4–10 × 2–4 (–5) mm; base acute, acroscopically enlarged; margins serrate to crenate, lobed; apex obtuse. Veins free, evident. Sori 3–6 pairs per pinna, on both basiscopic and acroscopic sides of pinnae. Spores 64 per sporangium. 2n = 144, 216.


Habitat: Sinkholes, limestone rocks in shady hammocks, masonry
Elevation: 0–50 m

Distribution

V2 599-distribution-map.gif

Fla., Ga., Mexico, West Indies in Cuba, Puerto Rico, Bermuda, Central America in Belize

Discussion

The tetraploid cytotype (4 x) of Asplenium heterochroum hybridizes with A. resiliens (3 x) to produce A. × heteroresiliens (5 x). It is extremely rare and local, known in northern peninsular Florida from Alachua, Citrus, Columbia, Jackson, and Marion counties.

Selected References

None.

Lower Taxa

None.
... more about "Asplenium heterochroum"
216 +  and 144 +
not rooting +
Obtuse (?) +, Acute (?) +  and Attenuate (?) +
Warren H. Wagner Jr. +, Robbin C. Moran +  and Charles R. Werth +
acute +  and tapered +
enlarged +
simple +  and 4-pinnate +
22 cm220 mm <br />0.22 m <br /> (37 cm370 mm <br />0.37 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
6 cm60 mm <br />0.06 m <br /> (22 cm220 mm <br />0.22 m <br />) +
oblanceolate;linear +
thin;1cm;1.8cm +
Varicolored spleenwort +
Fla. +, Ga. +, Mexico +, West Indies in Cuba +, Puerto Rico +, Bermuda +  and Central America in Belize +
0–50 m +
Sinkholes, limestone rocks in shady hammocks, masonry +
monomorphic +
fertile +  and than sterile ones +
lobed +, serrate +  and crenate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
perforate +, reticulate +, spiny +  and winged +
not articulate +
purplish black +  and black +
1/4 length of blade;1/15 length of blade +
c--shaped +
0.3 cm3 mm <br />0.003 m <br /> (5 cm50 mm <br />0.05 m <br />) +
not proliferous +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
filiform +  and linear-lanceolate +
0.2mm;0.4mm +
acroscopic +  and basiscopic +
less lunate;linear +
dorsiventral +  and symmetric +
ascending +  and erect +
Asplenium muticum +
Asplenium heterochroum +
Asplenium +
species +
anastomosing +