Overview

Distribution

Calif., Idaho, Nev., Oreg.
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National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Stems compact, ascending, stout, 5--10 mm diam.; scales mostly weakly bicolored, linear-subulate, 0.1--0.3 mm wide, centers dark brown, thin, margins lighter, thin, denticulate to entire. Leaves monomorphic, clustered on stem, 7--30 cm; croziers nearly glabrous. Petiole dark brown, lustrous, rounded adaxially, without prominent articulation lines. Blade linear, 1-pinnate, 1.5--4 cm wide; rachis brown throughout, straight, rounded adaxially, glabrous. Pinnae perpendicular to slightly ascending, usually not decurrent on rachis, simple and unlobed; costae absent. Ultimate segments broadly ovate to elliptic, 7--20 mm, leathery, glabrous; margins plane, not recurved, not covering abaxial surface, borders whitish, entire; apex obtuse to rounded. Veins of ultimate segments obscure. Sporangia sessile or subsessile, containing 64 spores, intermixed with abundant farina-producing glands. 2 n = 58.
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Type Information

Type collection for Pellaea bridgesii Hook.
Catalog Number: US 62532
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Verified from the card file of type specimens
Preparation: Pressed specimen
Collector(s): T. Bridges
Locality: California, United States, North America
  • Type collection: Hooker, W. J. 1858. Sp. Fil. 2: 238.
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Ecology

Habitat

Sporulating summer--fall. Rocky slopes and cliffs, on granitic substrates; 1200--3600m.
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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

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Wikipedia

Pellaea bridgesii

Pellaea bridgesii is a species of fern known by the common name Bridges' cliffbrake. It is native to an area of the western United States from northern California to Idaho, where it grows in rocky granitic cliffs and slopes.

Pellaea bridgesii grows from a branching brown rhizome. Each leaf is up to 30 or 35 centimeters long. It is composed of a straight brown rachis lined with widely spaced leathery, blue-green leaflets which are round to oval and sometimes folded over. The edges of the leaflets are not rolled under and do not cover the sporangia on the undersides.

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Notes

Comments

The morphology of Pellaea bridgesii is so distinctive that its sectional (and even generic) placement in Pellaea has long been a source of contention. W. H. Wagner Jr. et al. (1983) documented the existence of sterile diploid hybrids (called P . × glaciogena ) between P . bridgesii and P . mucronata (see reticulogram), suggesting that P . bridgesii is most closely related to members of sect. Pellaea . In addition to the more obvious characters mentioned above, P . bridgesii is distinguished from other North American species (except P . ternifolia ) by its anastomosing veins.
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