Overview

Distribution

Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah; n Mexico.
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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 somewhat dimorphic, sterile leaves shorter and less divided than fertile leaves, clustered on stems, 8--40 cm; croziers sparsely villous. Petiole dark brown, lustrous, flattened or slightly grooved adaxially, without prominent articulation lines. Blade ovate-deltate, usually 2-pinnate proximally, 4--18 cm wide; rachis brown throughout, straight, shallowly grooved adaxially, usually glabrous. Pinnae perpendicular to rachis to slightly ascending, not decurrent on rachis, usually with 9--25 ultimate segments; costae straight, 20--70 mm, much longer than fertile ultimate segments. Ultimate segments narrowly oblong, 4--10 mm, leathery, glabrous; margins recurved on fertile segments, usually covering less than 1/2 abaxial surface, borders whitish, nearly entire; apex mucronate. Veins of ultimate segments obscure. Sporangia long-stalked, containing 64 spores, intermixed with abundant farina-producing glands. 2 n = 58.
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Diagnostic Description

Synonym

Pellaea longimucronata Hooker; P. wrightiana Hooker var. longimucronata (Hooker) Davenport
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Type Information

Holotype for Pellaea truncata Goodd.
Catalog Number: US 692689
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): L. N. Goodding
Year Collected: 1911
Locality: Mule Mountains., Cochise, Arizona, United States, North America
  • Holotype: Goodding, L. N. 1912. Muhlenbergia. 8: 94.
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Isotype for Pellaea truncata Goodd.
Catalog Number: US 692690
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): L. N. Goodding
Year Collected: 1911
Locality: Bisbee, Mule Mountains., Cochise, Arizona, United States, North America
  • Isotype: Goodding, L. N. 1912. Muhlenbergia. 8: 94.
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Ecology

Habitat

Sporulating late spring--fall. Cliffs and rocky slopes, on various substrates but rarely observed on limestone; 600--2500m.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Pellaea truncata

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 truncata

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: N4 - Apparently Secure

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Pellaea truncata

Pellaea truncata is a species of fern known by the common name spiny cliffbrake. It is native to the southwestern United States and northern Mexico, where it grows in rocky areas, such as cliffs and slopes.

Description

The Pellaea truncata leaves are up to 40 centimeters long, the fertile leaves longer and more subdivided than the smaller, simpler sterile leaves. The leaf is composed of several leaflets which are each divided into several linear to oblong or pointed oval segments. The segments may have wavy edges, and the fertile ones have their edges rolled under. The sporangia are located under the edges.

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Notes

Comments

Most manuals refer to Pellaea truncata as P . longimucronata , a name shown to be invalid by A. Cronquist et al. (1972+, vol. 1). Populations located near the range of P . mucronata in the Mojave Desert are often difficult to identify because of the subtlety of the characters involved and an apparent tendency to produce sterile (and possibly fertile) hybrids. Morphologically intermediate hybrids between P . truncata and P . wrightiana are common in regions where the ranges of the two species overlap, but these are easily identified by their malformed spores.
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