Difference between revisions of "Adiantum jordanii"

Müller Halle

Bot. Zeitung 1864: 26. 1864.

Common names: California maidenhair
Illustrated
Treatment appears in FNA Volume 2.
FNA>Volume Importer
imported>Volume Importer
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V2/V2_522.xml
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|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V2/V2_522.xml
 
|genus=Adiantum
 
|genus=Adiantum
 
|species=Adiantum jordanii
 
|species=Adiantum jordanii

Revision as of 21:13, 27 May 2020

Stems short-creeping; scales reddish brown, concolored, margins entire. Leaves arching or pendent, clustered, 30–45 cm. Petiole 1–1.5 mm diam., glabrous, not glaucous. Blade lanceolate, pinnate, 20–24 × 8–10 cm, gradually reduced distally, glabrous; proximal pinnae 3(–4)-pinnate; rachis straight, glabrous, not glaucous. Segment stalks 1–4 mm, with dark color ending abruptly at segment base. Ultimate segments fan-shaped, not quite as long as broad; base truncate or broadly cuneate; margins of fertile segments unlobed but very narrowly incised, sterile segments with margins lobed, denticulate; apex rounded. Indusia transversely oblong, 3–10 mm, glabrous. Spores mostly 40–50 µm diam. 2n = 60.


Phenology: Sporulating early spring–midsummer.
Habitat: Seasonally moist, shaded, rocky banks, canyons, and ravines
Elevation: 0–1000 m

Distribution

V2 522-distribution-map.gif

Calif., Oreg., Mexico in Baja California.

Discussion

Adiantum jordanii occasionally hybridizes with A. aleuticum where their ranges overlap in northern California, yielding the sterile hybrid Adiantum × tracyi C. C. Hall ex W. H. Wagner. Adiantum × tracyi, morphologically intermediate between its parental species, can be distinguished from A. jordanii by its broadly deltate leaf blade that tapers abruptly from the 4(–5)-pinnate base to a 1-pinnate apex. It is best separated from A. aleuticum by leaf blades with a strong rachis, and by ultimate blade segments that are less than twice as long as broad. Adiantum × tracyi shows 59 univalents at metaphase; its spores are irregular and misshapen (W. H. Wagner Jr. 1962).

Selected References

None.

Lower Taxa

None.