Difference between revisions of "Cheilanthes yavapensis"
Contr. Univ. Michigan Herb. 19: 32. 1993.
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− | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>long-creeping, 1–3 mm diam.; scales often bicolored, with broad, poorly defined, dark, central stripe and narrow, brown margins, lanceolate, straight to slightly contorted, strongly appressed, persistent. <b>Leaves</b> scattered, 7–35 cm; vernation noncircinate. <b>Petiole</b> dark brown, rounded adaxially. <b>Blade</b> oblong-lanceolate to nearly ovate, 4-pinnate at base, 2–6 cm wide; rachis rounded adaxially, with scattered linear-lanceolate scales and sparse monomorphic pubescence. <b>Pinnae</b> not articulate, dark color of stalk continuing into pinna base, basal pair not conspicuously larger than adjacent pair, usually equilateral, appearing sparsely pubescent adaxially. <b>Costae</b> green adaxially for most of length; abaxial scales multiseriate, lanceolate, truncate to cordate at base, without overlapping basal lobes, conspicuous, the largest 0.4–1 mm wide, strongly imbricate, often concealing ultimate segments, ciliate, cilia coarse, usually distributed entire length of scale. <b>Ultimate</b> segments round to oblong, beadlike, the largest usually 1–2 mm, abaxially glabrous or with a few small scales near base, adaxially appearing sparsely pubescent but actually nearly glabrous. <b>False</b> indusia marginal, weakly differentiated, 0.05–0.25 mm wide. <b>Sori</b> ± continuous around segment margins. <b>Sporangia</b> containing 32 spores. n = 2n = 120, apogamous.</span><!-- |
-->{{Treatment/Body | -->{{Treatment/Body | ||
+ | |phenology=Sporulating summer–fall. | ||
|habitat=Rocky slopes and ledges, usually on igneous substrates | |habitat=Rocky slopes and ledges, usually on igneous substrates | ||
|elevation=500–2400 m | |elevation=500–2400 m | ||
|distribution=Ariz.;N.Mex.;Tex. | |distribution=Ariz.;N.Mex.;Tex. | ||
− | |discussion=<p>Cheilanthes yavapensis is an apogamous tetraploid, apparently formed by hybridization between C. lindheimeri and C. covillei (G. J. Gastony and M. D. Windham 1989). Although C. yavapensis has long been included within the concept of C. wootonii, the discovery that the similarities resulted from hybrid convergence rather than common ancestry requires that they be recognized as two distinct species. Unfortunately, the morphologic characteristics that separate these taxa are subtle, and careful study will be necessary to determine the proper dispositon of problematic specimens. In addition to the characteristics mentioned in the key, C. yavapensis is distinguished from C. wootonii by having larger spores, averaging more than 62 µm in diameter.</p> | + | |discussion=<p><i>Cheilanthes yavapensis</i> is an apogamous tetraploid, apparently formed by hybridization between <i>C. lindheimeri</i> and <i>C. covillei</i> (G. J. Gastony and M. D. Windham 1989). Although <i>C. yavapensis</i> has long been included within the concept of <i>C. wootonii</i>, the discovery that the similarities resulted from hybrid convergence rather than common ancestry requires that they be recognized as two distinct species. Unfortunately, the morphologic characteristics that separate these taxa are subtle, and careful study will be necessary to determine the proper dispositon of problematic specimens. In addition to the characteristics mentioned in the key, <i>C. yavapensis</i> is distinguished from <i>C. wootonii</i> by having larger spores, averaging more than 62 µm in diameter.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Cheilanthes yavapensis | name=Cheilanthes yavapensis | ||
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|authority=T. Reeves ex Windham | |authority=T. Reeves ex Windham | ||
|rank=species | |rank=species | ||
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|basionyms= | |basionyms= | ||
|family=Pteridaceae | |family=Pteridaceae | ||
+ | |phenology=Sporulating summer–fall. | ||
|habitat=Rocky slopes and ledges, usually on igneous substrates | |habitat=Rocky slopes and ledges, usually on igneous substrates | ||
|elevation=500–2400 m | |elevation=500–2400 m | ||
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|publication year=1993 | |publication year=1993 | ||
|special status= | |special status= | ||
− | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V2/V2_59.xml |
|genus=Cheilanthes | |genus=Cheilanthes | ||
|species=Cheilanthes yavapensis | |species=Cheilanthes yavapensis | ||
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-->[[Category:Treatment]][[Category:Cheilanthes]] | -->[[Category:Treatment]][[Category:Cheilanthes]] |
Latest revision as of 21:24, 5 November 2020
Stems long-creeping, 1–3 mm diam.; scales often bicolored, with broad, poorly defined, dark, central stripe and narrow, brown margins, lanceolate, straight to slightly contorted, strongly appressed, persistent. Leaves scattered, 7–35 cm; vernation noncircinate. Petiole dark brown, rounded adaxially. Blade oblong-lanceolate to nearly ovate, 4-pinnate at base, 2–6 cm wide; rachis rounded adaxially, with scattered linear-lanceolate scales and sparse monomorphic pubescence. Pinnae not articulate, dark color of stalk continuing into pinna base, basal pair not conspicuously larger than adjacent pair, usually equilateral, appearing sparsely pubescent adaxially. Costae green adaxially for most of length; abaxial scales multiseriate, lanceolate, truncate to cordate at base, without overlapping basal lobes, conspicuous, the largest 0.4–1 mm wide, strongly imbricate, often concealing ultimate segments, ciliate, cilia coarse, usually distributed entire length of scale. Ultimate segments round to oblong, beadlike, the largest usually 1–2 mm, abaxially glabrous or with a few small scales near base, adaxially appearing sparsely pubescent but actually nearly glabrous. False indusia marginal, weakly differentiated, 0.05–0.25 mm wide. Sori ± continuous around segment margins. Sporangia containing 32 spores. n = 2n = 120, apogamous.
Phenology: Sporulating summer–fall.
Habitat: Rocky slopes and ledges, usually on igneous substrates
Elevation: 500–2400 m
Distribution
Ariz., N.Mex., Tex.
Discussion
Cheilanthes yavapensis is an apogamous tetraploid, apparently formed by hybridization between C. lindheimeri and C. covillei (G. J. Gastony and M. D. Windham 1989). Although C. yavapensis has long been included within the concept of C. wootonii, the discovery that the similarities resulted from hybrid convergence rather than common ancestry requires that they be recognized as two distinct species. Unfortunately, the morphologic characteristics that separate these taxa are subtle, and careful study will be necessary to determine the proper dispositon of problematic specimens. In addition to the characteristics mentioned in the key, C. yavapensis is distinguished from C. wootonii by having larger spores, averaging more than 62 µm in diameter.
Selected References
None.