Difference between revisions of "Asplenium dalhousiae"
Icon. Pl. plate 105. 1837.
Common names: Countess Dalhousie's spleenwort
Synonyms: Ceterach dalhousiae (Hooker) C. ChristensenCeterachopsis dalhousiae (Hooker) Ching
Treatment appears in FNA Volume 2.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Roots </b>not proliferous. <b>Stems</b> erect, unbranched; scales black with brown margins, lanceolate, 2–5 × 0.6–1 mm, sparsely denticulate. <b>Leaves</b> monomorphic. <b>Petiole</b> dark to light brown throughout, dull, to 1 cm, 1/10–1/15 length of blade, indument of scales throughout. <b>Blade</b> narrowly elliptic to narrowly lanceolate, pinnatifid, 4–15 × 1.5–6 cm, thick, sparsely puberulent to glabrescent; base gradually tapered; apex obtuse, not rooting. <b>Rachis</b> light brown to tan, dull-scaly; scales brown, lanceolate. <b>Veins</b> free, obscure. <b>Sori</b> 3–7 pairs per pinna, on both basiscopic and acroscopic sides of lobes. <b>Spores</b> 64 per sporangium. <b>2n</b> = 72.</span><!-- |
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|genus=Asplenium | |genus=Asplenium | ||
|species=Asplenium dalhousiae | |species=Asplenium dalhousiae | ||
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Revision as of 13:12, 27 July 2019
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
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.