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Overview

Distribution

Localities documented in Tropicos sources

Pellaea weddelliana Fée:
Bolivia (South America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Localities documented in Tropicos sources

Pellaea brandegeei C.C. Hall:
Mexico (Mesoamerica)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Localities documented in Tropicos sources

Pellaea ternifolia (Cav.) Link:
Mexico (Mesoamerica)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: A New World fern indigenous to Hawaii (Valier 1995). TX, MX, Central America, South America (to Peru, Argentina & n. Chile, Hispaniola, Hawaii

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Physical Description

Morphology

Description

Stems compact, ascending, stout, 5--10 mm diam.; scales bicolored, linear-subulate, 0.1--0.3 mm wide, centers black, thick, margins brown, thin, erose-dentate. Leaves monomorphic, clustered on stem, 10--50 cm; croziers sparsely to densely villous. Petiole black or dark purple, lustrous, rounded or slightly flattened adaxially, without prominent articulation lines. Blade linear to ovate, deeply pinnate-pinnatifid proximally, 2.5--8 cm wide; rachis black or purple throughout, straight, often flattened adaxially, glabrous or villous. Pinnae perpendicular to rachis or slightly ascending, not decurrent on rachis, ternate at base of leaf; costae absent. Ultimate segments linear-oblong, 10--40 mm, leathery, glabrous to sparsely villous abaxially on midrib; margins recurved on fertile segments, rarely covering more than 1/2 abaxial surface, borders whitish, entire; apex mucronate. Veins of ultimate segments obscure. Sporangia long-stalked, containing 64 spores, not intermixed with farina-producing glands.
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Diagnostic Description

Synonym

Pteris ternifolia Cavanilles, Descr. Pl., 266. 1802
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Ecology

Habitat

Comments: Terrestrial, in dry open areas, but also occurring in shaded gullies, 305-2440m (Valier 1995). Rocky slopes and ledges on igneous substrates; 2200-2600 m.

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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: G5 - Secure

Reasons: Reported to occur in western TX, south through MX and Central America to Peru, Argentina, and northern Chile; also Hispaniola & Hawaii (Correll & Johnston 1970).

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Notes

Comments

Pellaea ternifolia is represented in the flora by three morphologically and chromosomally distinct taxa. These discrete genetic entities also show a tendency toward geographic isolation and are treated here as subspecies. Diploid populations referred to P . ternifolia subsp. ternifolia are scattered from Texas through Mexico to South America. The pubescent tetraploid ( P . ternifolia subsp. villosa ) follows the Sierra Madre Oriental from Puebla, Mexico, north to Texas; the glabrous tetraploid ( P . ternifolia subsp. arizonica ) occurs in Arizona, Texas, and northern Mexico. Isozyme and chromosome studies suggest that both tetraploids are segmental allopolyploids produced by hybridization between subsp. ternifolia and other (as yet unidentified) diploid elements within P . ternifolia .
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