Adiantum jordanii — Details

Adiantum jordanii C.H. Mull.:
Mexico (Mesoamerica)
United States (North America)

Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville. http://www.tropicos.org/Reference/1103
Lellinger, D. B. 1985. A Field Manual of the Ferns and Fern Allies of the United States and Canada. 389 pp. http://www.tropicos.org/Reference/1316
Mickel, J. T. & A. R. Smith. 2004. The Pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1–1054. http://www.tropicos.org/Reference/1025841
Taylor, T. M. C. 1970. Pacific Northwest Ferns and Their Allies. 247 pp. http://www.tropicos.org/Reference/1292
Munz, P. A. & D. D. Keck. 1959. Cal. Fl. 1–1681. University of California Press, Berkeley. http://www.tropicos.org/Reference/1717
Munz, P. A. 1974. Fl. S. Calif. 1–1086. University of California Press, Berkeley. http://www.tropicos.org/Reference/1719
Flora of North America Editorial Committee, e. 1993. Pteridophytes and Gymnosperms. 2: i–xvi, 1–475. In Fl. N. Amer. Oxford University Press, New York. http://www.tropicos.org/Reference/10884

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National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Source: NatureServe

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Physical Description

Morphology

Comments

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).

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Description

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. 2 n = 60 .

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Ecology

Habitat

Habitat & Distribution

Sporulating early spring--midsummer. Seasonally moist, shaded, rocky banks, canyons, and ravines; 0--1000 m; Calif., Oreg.; Mexico in Baja California.

Flora of North America @ eFloras.org

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Adiantum jordanii

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Species: 1
Species With Barcodes: 1

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Source: Barcode of Life Data Systems (BOLD)

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G4 - Apparently Secure

Reasons: Frequent in Oregon and California.

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Wikipedia

Adiantum jordanii

Adiantum jordanii is a perennial species of maidenhair fern known by the common name California maidenhair.^[1]

It is native to California and Baja California. A. jordanii is found in the southernmost part of its range in Baja California with such flora associates as Mimulus aridus and Daucus pusillus.^[2]

Each trailing leaf may reach over half a meter in length and is made up of many rounded green segments. Each segment has two to four lobes and it may split between the lobes,^[3] the underside of each segment bearing one to four sori.

Adiantum jordanii, from native plant nurseries, is used in native plant and wildlife gardens.

Notes

^ U.S. Department of Agriculture. 2009
^ C. Michael Hogan. 2008
^ Jepson Manual. 1993

References

C. Michael Hogan. 2008. Coastal Woodfern (Dryopteris arguta}, GlobalTwitcher, ed. N. Stromberg
Jepson Manual. 1993. Adiantum jordanii, University of California, Berkeley
U.S. Department of Agriculture. 2009. USDA Plants Profile: Adiantum jordanii

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