Difference between revisions of "Selaginella arenicola"
Bull. Torrey Bot. Club 25: 541. 1898.
FNA>Volume Importer |
imported>Volume Importer |
||
| Line 8: | Line 8: | ||
}} | }} | ||
|common_names=Sand spike-moss | |common_names=Sand spike-moss | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }} | ||
|basionyms= | |basionyms= | ||
|synonyms= | |synonyms= | ||
| Line 20: | Line 24: | ||
-->{{Treatment/Body | -->{{Treatment/Body | ||
| − | |distribution= | + | |distribution=Ala.;Ark.;Fla.;Ga.;La.;Okla.;Tex.;only in the flora. |
|discussion=<p><i>Selaginella arenicola</i> and related species have been considered as forming a species complex. This interpretation has been the center of much taxonomic controversy (R. M. Tryon 1955; G. P. Van Eseltine 1918). Tryon recognized one species in the complex, <i>S. arenicola</i>, with three subspecies: <i></i>subsp.<i> arenicola</i>, <i></i>subsp.<i> riddellii</i>, and subsp. acanthonata. Other authors (e.g., R. T. Clausen 1946) treated the subspecies as species. I recognize two well-defined species within this complex, <i>S. arenicola</i> and <i>S. acanthonota</i>, which are readily distinguishable by the characteristics given in the key. Some specimens reported by R. M. Tryon (1955) as intermediate between <i>S. arenicola</i> and <i>S. acanthonota</i> appear to be hybrids between <i>S. acanthonota</i> and <i>S. rupestris</i>. In particular, more detailed studies are needed to assess whether populations from Georgia are hybrids or variants of <i>S. acanthonota</i> or of <i>S. rupestris</i>. Future studies are also needed to determine relationships and proper taxonomic rank of <i>Selaginella arenicola </i>subsp.<i> arenicola</i> and <i></i>subsp.<i> riddellii</i>, which are provisionally recognized here.</p><!-- | |discussion=<p><i>Selaginella arenicola</i> and related species have been considered as forming a species complex. This interpretation has been the center of much taxonomic controversy (R. M. Tryon 1955; G. P. Van Eseltine 1918). Tryon recognized one species in the complex, <i>S. arenicola</i>, with three subspecies: <i></i>subsp.<i> arenicola</i>, <i></i>subsp.<i> riddellii</i>, and subsp. acanthonata. Other authors (e.g., R. T. Clausen 1946) treated the subspecies as species. I recognize two well-defined species within this complex, <i>S. arenicola</i> and <i>S. acanthonota</i>, which are readily distinguishable by the characteristics given in the key. Some specimens reported by R. M. Tryon (1955) as intermediate between <i>S. arenicola</i> and <i>S. acanthonota</i> appear to be hybrids between <i>S. acanthonota</i> and <i>S. rupestris</i>. In particular, more detailed studies are needed to assess whether populations from Georgia are hybrids or variants of <i>S. acanthonota</i> or of <i>S. rupestris</i>. Future studies are also needed to determine relationships and proper taxonomic rank of <i>Selaginella arenicola </i>subsp.<i> arenicola</i> and <i></i>subsp.<i> riddellii</i>, which are provisionally recognized here.</p><!-- | ||
--><p>Subspecies 2.</p> | --><p>Subspecies 2.</p> | ||
| Line 51: | Line 55: | ||
|basionyms= | |basionyms= | ||
|family=Selaginellaceae | |family=Selaginellaceae | ||
| − | |distribution= | + | |distribution=Ala.;Ark.;Fla.;Ga.;La.;Okla.;Tex.;only in the flora. |
|reference=None | |reference=None | ||
|publication title=Bull. Torrey Bot. Club | |publication title=Bull. Torrey Bot. Club | ||
|publication year=1898 | |publication year=1898 | ||
| − | |special status= | + | |special status=Endemic |
| − | |source xml=https:// | + | |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V2/V2_798.xml |
|genus=Selaginella | |genus=Selaginella | ||
|subgenus=Selaginella subg. Tetragonostachys | |subgenus=Selaginella subg. Tetragonostachys | ||
Revision as of 22:15, 27 May 2020
Plants terrestrial or on rock, forming clumps. Stems radially symmetric, underground (rhizomatous) and aerial, not readily fragmenting, irregularly forked; rhizomatous and aerial stems often with 1 branch arrested, budlike, tips straight; rhizomatous stems mostly ascending; aerial stems erect or ascending. Rhizophores borne on upperside of stems, restricted to rhizomatous stems, 0.2–0.33 mm diam. Leaves dimorphic, in pseudowhorls of 4. Rhizomatous stem leaves persistent, appressed, scalelike. Aerial stem leaves tightly or somewhat loosely appressed, ascending, green, narrowly triangular-lanceolate or narrowly lanceolate, 2–3 × 0.4–0.5 mm; abaxial ridges present; base cuneate, strongly decurrent, pubescent or glabrescent; hairs restricted to base; margins short-ciliate, cilia transparent, scattered, spreading at base, dentiform and ascending toward apex, 0.02–0.07 mm; apex plane, attenuate; bristle white to whitish, straight, coarsely puberulent, 0.25–0.85(–0.9) mm. Strobili solitary, (0.5–)1–3(–3.5) cm; sporophylls ovate-lanceolate to lanceolate, often abruptly tapering toward apex, abaxial ridges not prominent, base glabrous, rarely with few hairs, margins ciliate, apex often recurved, bristled.
Distribution
Ala., Ark., Fla., Ga., La., Okla., Tex., only in the flora.
Discussion
Selaginella arenicola and related species have been considered as forming a species complex. This interpretation has been the center of much taxonomic controversy (R. M. Tryon 1955; G. P. Van Eseltine 1918). Tryon recognized one species in the complex, S. arenicola, with three subspecies: subsp. arenicola, subsp. riddellii, and subsp. acanthonata. Other authors (e.g., R. T. Clausen 1946) treated the subspecies as species. I recognize two well-defined species within this complex, S. arenicola and S. acanthonota, which are readily distinguishable by the characteristics given in the key. Some specimens reported by R. M. Tryon (1955) as intermediate between S. arenicola and S. acanthonota appear to be hybrids between S. acanthonota and S. rupestris. In particular, more detailed studies are needed to assess whether populations from Georgia are hybrids or variants of S. acanthonota or of S. rupestris. Future studies are also needed to determine relationships and proper taxonomic rank of Selaginella arenicola subsp. arenicola and subsp. riddellii, which are provisionally recognized here.
Subspecies 2.
Selected References
None.
Key
| 1 | Leaves mostly tightly appressed; base conspicuously pubescent; strobili distinctly larger in diameter than subtending stem; sporophyll apex often recurved. | Selaginella arenicola subsp. arenicola |
| 1 | Leaves usually loosely appressed; base very often glabrescent; strobili not distinctly larger in diameter than subtending stem; sporophyll apex usually straight. | Selaginella arenicola subsp. riddellii |