Dennstaedtia bipinnata

(Cavanilles) Maxon

Proc. Biol. Soc. Wash. 61: 39. 1938.

Common names: Bipinnate cuplet fern cuplet fern
Basionym: Dicksonia bipinnata Cavanilles Descr. Pl., 174. 1802
Treatment appears in FNA Volume 2.

Stems long-creeping, 5–6 mm diam. Leaves clustered to well separated, arching, 1.5–2.5 × ca. 1 m. Petiole straw-colored to brown, darker at base, lustrous, 1/2 to equal length of blade, sparsely pubescent with soft, jointed hairs at base when young. Blade bright green, lustrous, ovate, 2–4-pinnate, 1/2 to nearly as wide as long, base obtuse, apex acute, sparsely pubescent throughout to nearly glabrous abaxially. Basal segments of pinnules opposite; ultimate segments mostly oblong-ovate, base inequilaterally cuneate, margins incised-dentate. Sori globose to almost cylindric; indusia tubular or cylindric. Spores trilete, prominently 3-lobed, surface irregularly tuberculate. 2n = 188.


Phenology: Sporulates spring and early summer.
Habitat: Moist to wet, forested habitats in acid soils
Elevation: 0 m

Distribution

V2 56-distribution-map.gif

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

Discussion

Dennstaedtia bipinnata was first found in Florida in 1926 around Lake Okeechobee (J. K. Small 1938). These populations have been extirpated and have been replaced by sugar cane and other agriculture. Populations in Seminole County may be naturalized. The species has been reported as occurring in Okeechobee County. Collections made in the 1920s from Palm Beach County suggest that this species may be native, although Pteris tripartita Swartz, which is definitely naturalized, was also collected in that region at that time.

Selected References

None.

Lower Taxa

None.

"equal" is not a number.

... more about "Dennstaedtia bipinnata"
glabrous +  and pubescent +
Clifton E. Nauman +  and A. Murray Evans +
(Cavanilles) Maxon +
cuneate +  and obtuse +
Dicksonia bipinnata +
1-pinnate;decompound +
bright green +
with mixture +, hairy +  and glabrous +
Bipinnate cuplet fern +  and cuplet fern +
Fla. +, Mexico +, West Indies +, Central America +  and South America to Bolivia +
Moist to wet, forested habitats in acid soils +
dark reddish-brown +
2-valvate +  and circular +
cylindric +  and tubular +
monomorphic +
separated +  and clustered to well +
150 cm1,500 mm <br />1.5 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
ovate +  and lanceolate +
40 cm400 mm <br />0.4 m <br /> (300 cm3,000 mm <br />3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (?) +
incised-dentate +
lobed +  and dentate +
not articulate +
darker;straw-colored;brown +
Sporulates spring and early summer. +
Proc. Biol. Soc. Wash. +
distinct +
cylindric +  and globose to almost +
3-lobed +
branching +  and solenostelic +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
subterranean +
tuberculate +
Dennstaedtia bipinnata +
Dennstaedtia +
species +
forking +  and pinnate +
47 +, 46 +  and 34 +