Difference between revisions of "Pellaea mucronata"
in Emory,Rep. U.S. Mex. Bound. 2(1): 233. 1859.
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|name=Allosorus mucronatus | |name=Allosorus mucronatus | ||
|authority=D. C. Eaton | |authority=D. C. Eaton | ||
| + | |rank=species | ||
|publication_title=Amer. J. Sci. Arts | |publication_title=Amer. J. Sci. Arts | ||
|publication_place=22: 138. 1856 | |publication_place=22: 138. 1856 | ||
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|name=Pellaea ornithopus | |name=Pellaea ornithopus | ||
|authority=Hooker | |authority=Hooker | ||
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Pteridaceae;Pellaea;Pellaea mucronata | |hierarchy=Pteridaceae;Pellaea;Pellaea mucronata | ||
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|distribution=North America;Mexico. | |distribution=North America;Mexico. | ||
|discussion=<p>Subspecies 2 (2 in the flora).</p><!-- | |discussion=<p>Subspecies 2 (2 in the flora).</p><!-- | ||
| − | --><p><i>Pellaea mucronata</i> encompasses two morphologic extremes that tend to occupy different habitats and are treated here as subspecies. The typical 3-pinnate form (<i>P. mucronata </i>subsp.<i> mucronata</i>) is scattered throughout California and southern <i>Nevada</i>, usually below 1800 m elevation. The 2-pinnate form with ascending, overlapping pinnae (<i>P. mucronata </i>subsp.<i> californica</i>) is apparently confined to the Sierra <i>Nevada</i> and Transverse Ranges of California at elevations greater than 1800 m. The taxonomic status of these entities remains in dispute, and they are often treated as mere ecological forms. W. H. Wagner Jr. et al. (1983) indicated that natural hybrids formed between <i>P. bridgesii</i> and these two taxa are morphologically distinct, suggesting that the differences observed between the subspecies of <i>P. mucronata</i> are genetically based. In addition to <i>P. bridgesii</i>, < | + | --><p><i>Pellaea mucronata</i> encompasses two morphologic extremes that tend to occupy different habitats and are treated here as subspecies. The typical 3-pinnate form (<i>P. mucronata </i>subsp.<i> mucronata</i>) is scattered throughout California and southern <i>Nevada</i>, usually below 1800 m elevation. The 2-pinnate form with ascending, overlapping pinnae (<i>P. mucronata </i>subsp.<i> californica</i>) is apparently confined to the Sierra <i>Nevada</i> and Transverse Ranges of California at elevations greater than 1800 m. The taxonomic status of these entities remains in dispute, and they are often treated as mere ecological forms. W. H. Wagner Jr. et al. (1983) indicated that natural hybrids formed between <i>P. bridgesii</i> and these two taxa are morphologically distinct, suggesting that the differences observed between the subspecies of <i>P. mucronata</i> are genetically based. In addition to <i>P. bridgesii</i>, <i></i>subsp.<i> mucronata</i> apparently hybridizes with both <i>P. truncata</i> and <i>P. brachyptera</i> (see comments under those species).</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Pellaea mucronata | name=Pellaea mucronata | ||
| − | |||
|authority=(D. C. Eaton) D. C. Eaton in Emory | |authority=(D. C. Eaton) D. C. Eaton in Emory | ||
|rank=species | |rank=species | ||
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|publication year=1859 | |publication year=1859 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V2/V2_700.xml |
|genus=Pellaea | |genus=Pellaea | ||
|species=Pellaea mucronata | |species=Pellaea mucronata | ||
Revision as of 19:50, 16 December 2019
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, 7–45 cm; croziers sparsely villous. Petiole dark brown, lustrous, flattened to slightly grooved adaxially, without prominent articulation lines. Blade ovate-deltate, (2–)3-pinnate proximally, 4–18 cm wide; rachis brown throughout, straight, shallowly grooved adaxially, usually glabrous. Pinnae perpendicular to rachis to strongly ascending, not decurrent on rachis, usually with 9–40 ultimate segments; costae straight, 10–70 mm, much longer than ultimate segments. Ultimate segments narrowly oblong, 2–12 mm, leathery, glabrous; margins recurved to strongly revolute on fertile segments, usually covering more than 1/2 abaxial surface, borders greenish, usually dentate; apex mucronate. Veins of ultimate segments obscure. Sporangia short-stalked, containing 64 spores, intermixed with abundant farina-producing glands.
Distribution
North America, Mexico.
Discussion
Subspecies 2 (2 in the flora).
Pellaea mucronata encompasses two morphologic extremes that tend to occupy different habitats and are treated here as subspecies. The typical 3-pinnate form (P. mucronata subsp. mucronata) is scattered throughout California and southern Nevada, usually below 1800 m elevation. The 2-pinnate form with ascending, overlapping pinnae (P. mucronata subsp. californica) is apparently confined to the Sierra Nevada and Transverse Ranges of California at elevations greater than 1800 m. The taxonomic status of these entities remains in dispute, and they are often treated as mere ecological forms. W. H. Wagner Jr. et al. (1983) indicated that natural hybrids formed between P. bridgesii and these two taxa are morphologically distinct, suggesting that the differences observed between the subspecies of P. mucronata are genetically based. In addition to P. bridgesii, subsp. mucronata apparently hybridizes with both P. truncata and P. brachyptera (see comments under those species).
Selected References
None.
Key
| 1 | Blades 3-pinnate proximally; pinnae usually ± perpendicular to rachis, not overlapping; plants usually found below 1800 m. | Pellaea mucronata subsp. mucronata |
| 1 | Blades usually 2-pinnate proximally; pinnae ascending and overlapping, especially in distal portion of leaf; plants usually found above 1800 m. | Pellaea mucronata subsp. californica |