Facts about Jones' False Cloak Fern (Argyrochosma jonesii)

Cheilanthes jonesii (Maxon) Munz:
United States (North America)

Munz, P. A. & D. D. Keck. 1959. Cal. Fl. 1–1681. University of California Press, Berkeley. http://www.tropicos.org/Reference/1717

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Notholaena jonesii Maxon:
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
Munz, P. A. 1974. Fl. S. Calif. 1–1086. University of California Press, Berkeley. http://www.tropicos.org/Reference/1719

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National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Morphology

Comments

Argyrochosma jonesii includes two sexually reproducing cytotypes. The diploid is known from a few localities in the Sonoran and Mojave Deserts; the tetraploid is found throughout the Mojave Desert and cismontane southern California. Although subtle morphologic differences exist between these cytotypes, they are distinguished primarily by characteristics known to correlate with increases in ploidy level (such as spore size and the length of stomatal guard cells). Further investigation is necessary to determine whether the tetraploid arose through autopolyploidy or hybridization between cryptic species.

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Description

Stem scales brown to nearly black. Leaves 4--15 cm. Petiole dark brown, 0.75--1.5 mm diam. Blade ovate-lanceolate, 2--3-pinnate proximally, leathery, abaxially and adaxially glabrous; rachis rounded to slightly flattened adaxially. Pinna costae straight or nearly so, branches not arising from prominent angles. Ultimate segments not articulate, dark color of stalks continuing into segment bases abaxially; segment margins plane to slightly recurved, not concealing sporangia; veins obscure adaxially. Sporangia submarginal, borne on distal 1/2 of secondary veins, containing 64 spores. 2 n = 54, 108.

Flora of North America @ eFloras.org

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Diagnostic Description

Synonym

Notholaena jonesii Maxon, Amer. Fern J. 7: 108. 1917; Cheilanthes jonesii (Maxon) Munz; Pellaea jonesii (Maxon) C. V. Morton

Flora of North America @ eFloras.org

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Habitat

Habitat & Distribution

Sporulating spring--fall. Calcareous cliffs and ledges; 600--1900 m; Ariz., Calif., Nev., Utah; Mexico in Sonora.

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Molecular Biology

Statistics of barcoding coverage: Argyrochosma jonesii

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Species: 2
Species With Barcodes: 1

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Conservation Status

NatureServe Conservation Status

Rounded Global Status Rank: G4 - Apparently Secure

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National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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Argyrochosma jonesii

Argyrochosma jonesii is a species of fern native to the southwestern United States and northern Mexico. Its common name is Jones' false cloak fern. It grows in cracks in calcareous ledges and slopes in and around the Mojave and Sonoran Deserts. This fern produces leaves up to 15 centimeters long which are made up of leaflets subdivided into leathery, fleshy segments which are rounded to spade-shaped. Each sporangium contains 64 spores.

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