Astrolepis sinuata

(Lagasca ex Swartz) D. M. Benham & Windham

Amer. Fern J. 82: 56. 1992.

Basionyms: Acrostichum sinuatum Lagasca ex Swartz Syn. Fil., 14. 1806
Synonyms: Cheilanthes sinuata (Lagasca ex Swartz) Domin Notholaena sinuata (Lagasca ex Swartz) Kaulfuss
Treatment appears in FNA Volume 2. Treatment on page 142.

Stems compact to short-creeping; stem scales uniformly chestnut-brown or with lighter margin, to 6 mm, margins ciliate-dentate. Leaves 11–130 cm. Blade pinnate-pinnatifid, pinna pairs 30–60. Pinnae deltate to ovate, largest 7–35 mm, symmetrically lobed, lobes 6–14 often acute, separated by deep sinuses; abaxial scales concealing surface, lanceolate, usually 1–1.5 mm, ciliate-dentate with delicate marginal projections; adaxial scales sparse, deciduous, elongate, stellate, attached at base, body 1–2 cells wide, attached at base. Sporangia containing 32 or 64 spores.

Distribution

Ariz., Ga., N.Mex., Tex., Mexico, West Indies, Central America, South America

Discussion

Subspecies 2 (2 in the flora).

Astrolepis sinuata comprises two cytotypes that tend to occupy different ranges and are treated here as subspecies. Sexual diploid populations (subsp. mexicana) are widely distributed in Mexico, but in the flora they are apparently confined to the Davis and Chisos mountains of Texas and to southeast New Mexico. The range of the apogamous triploid (subsp. sinuata) extends from Argentina to the southwestern United States, with a disjunct population in Georgia. Isozyme studies suggest that subsp. sinuata was derived from the diploid subsp. mexicana through autopolyploidy (D. M. Benham 1989).

Selected References

None.

Key

1 Sporangia containing 32 spores; spores averaging 50– 65 µm diam.; plants widespread in sw United States and disjunct in Georgia. Astrolepis sinuata subsp. sinuata
1 Sporangia containing 64 spores; spores averaging 37– 44 µm diam.; plants apparently restricted to w Texas and se New Mexico. Astrolepis sinuata subsp. mexicana
... more about "Astrolepis sinuata"
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Dale M. Benham +  and Michael D. Windham +
(Lagasca ex Swartz) D. M. Benham & Windham +
Acrostichum sinuatum +
glabrescent +
pinnate-pinnatifid +
Ariz. +, Ga. +, N.Mex. +, Tex. +, Mexico +, West Indies +, Central America +  and South America +
yellow +  and white +
obcordate;reniform +
monomorphic +
recurved +  and reflexed +
noncircinate +  and circinate +
11 cm110 mm <br />0.11 m <br /> (130 cm1,300 mm <br />1.3 m <br />) +
6 +  and 14 +
straw-colored;chestnut-brown;dull +
largest +
0.7 cm7 mm <br />0.007 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
Amer. Fern J. +
overlapping +
tan;chestnut-brown concolored +
persistent +
lanceolate +  and ovate +
64 (?) +  and 32 (?) +
light +  and dark-brown +
1 +, 32 +  and 64 +
tetrahedral-globose +
erect +  and ascending +
with lighter margin +  and chestnut-brown +
0 cm0 mm <br />0 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Cheilanthes sinuata +  and Notholaena sinuata +
Astrolepis sinuata +
Astrolepis +
species +
crescent--shaped +  and roundish +