Asplenium dalhousiae

Hooker

Icon. Pl. plate 105. 1837.

Common names: Countess Dalhousie's spleenwort
Synonyms: Ceterach dalhousiae (Hooker) C. Christensen Ceterachopsis dalhousiae (Hooker) Ching
Treatment appears in FNA Volume 2.

Roots not proliferous. Stems erect, unbranched; scales black with brown margins, lanceolate, 2–5 × 0.6–1 mm, sparsely denticulate. Leaves monomorphic. Petiole dark to light-brown throughout, dull, to 1 cm, 1/10–1/15 length of blade, indument of scales throughout. Blade narrowly elliptic to narrowly lanceolate, pinnatifid, 4–15 × 1.5–6 cm, thick, sparsely puberulent to glabrescent; base gradually tapered; apex obtuse, not rooting. Rachis light-brown to tan, dull-scaly; scales brown, lanceolate. Veins free, obscure. Sori 3–7 pairs per pinna, on both basiscopic and acroscopic sides of lobes. Spores 64 per sporangium. 2n = 72.


Habitat: Moist, rocky ravines, terrestrial among and at bases of rocks
Elevation: 1300–2000 m

Distribution

V2 160-distribution-map.gif

Ariz., n Mexico, Asia in the Himalayas

Discussion

In the flora, Asplenium dalhousiae is found only in the Mule, Huachuca, and Baboquivari mountains of southern Arizona. The pattern of disjunction in the worldwide range of this species is highly unusual.

Asplenium dalhousiae is sometimes placed in the genus Ceterach on the basis of its thick, pinnatifid leaves. Most pteridologists, however, restrict Ceterach to species with densely scaly, pinnatifid leaves. Asplenium dalhousiae is placed in Ceterachopsis by pteridologists who believe it merits its own genus.

Selected References

None.

Lower Taxa

None.
... more about "Asplenium dalhousiae"
not rooting +
Warren H. Wagner Jr. +, Robbin C. Moran +  and Charles R. Werth +
Hooker +
tapered +
simple +  and 4-pinnate +
4 cm40 mm <br />0.04 m <br /> (15 cm150 mm <br />0.15 m <br />) +
sparsely puberulent +  and glabrescent +
pinnatifid;narrowly elliptic;narrowly lanceolate +
thick;1.5cm;6cm +
Countess Dalhousie's spleenwort +
Ariz. +, n Mexico +  and Asia in the Himalayas +
1300–2000 m +
Moist, rocky ravines, terrestrial among and at bases of rocks +
monomorphic +
fertile +  and than sterile ones +
perforate +, reticulate +, spiny +  and winged +
not articulate +
dark +  and light-brown +
1/10 length of blade;1/15 length of blade +
c--shaped +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
light-brown +  and tan +
not proliferous +
brown +  and black +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
lanceolate +  and denticulate +
0.6mm;1mm +
acroscopic +  and basiscopic +
less lunate;linear +
dorsiventral +  and symmetric +
Ceterach dalhousiae +  and Ceterachopsis dalhousiae +
Asplenium dalhousiae +
Asplenium +
species +
anastomosing +