Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Ariz., N.Mex., Tex.; n Mexico.
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Physical Description

Morphology

Description

Stems creeping, horizontal, slender, 2--4 mm diam.; scales mostly bicolored, narrowly lanceolate, largest scales 0.3--0.8 mm wide, centers black, thick, margins brown, thin, irregularly dentate. Leaves monomorphic, widely scattered along stem, 12--50 cm; croziers pubescent and bearing a few scales. Petiole straw-colored, tan, or gray, not lustrous, rounded or slightly flattened adaxially, without prominent articulation lines. Blade ovate to elongate-deltate, usually 2-pinnate proximally, 4--20 cm wide; rachis tan throughout, straight to slightly flexuous, rounded or flattened adaxially, ± pubescent. Pinnae perpendicular to rachis or slightly ascending, not decurrent on rachis, usually with 7--21 ultimate segments; costae straight to slightly flexuous, 20--100 mm, longer than ultimate segments. Ultimate segments ovate to elliptic, 5--15 mm, leathery, glabrous or usually puberulent abaxially; margins recurved on fertile segments, usually covering less than 1/2 abaxial surface, borders whitish, nearly entire; apex obtuse to slightly mucronate. Veins of ultimate segments obscure. Sporangia short-stalked, containing 32 spores, not intermixed with farina-producing glands. n = 2 n = 87, 116, apogamous.
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Diagnostic Description

Synonym

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Ecology

Habitat

Comments: On dry, rocky slopes and ladges, cap rock, cliffs and about boulders of limestone and igneous rock, up to 7,000 ft. (Correll and Johnston, 1970).

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Sporulating summer--fall. Rocky slopes and ledges, on a variety of substrates, including limestone and granite; 300--2400m.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Pellaea intermedia

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Pellaea intermedia

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
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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: Found in 4 counties of Arizona, 9 counties of N. Mexico, the Trans-Pecos region of Texas, as well as two other Texas counties. Found in Mexico, but abundance not known. Recommended rank of G5 from TXHP (3/94); distribution includes MX (FNA 1993).

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Notes

Comments

Plants of Pellaea intermedia in the flora are apogamous triploids and tetraploids; a sexual diploid cytotype has been found near Saltillo, Mexico (A. F. Tryon 1968). Given the high degree of morphologic similarity among the three cytotypes, the North American polyploids probably were derived from the Mexican diploid through autopolyploidy.
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