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3 résultat(s) recherche sur le mot-clé 'Taxa' 
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la recherche Générer le flux rss de la recherchePhylogenetic Relationships among Sphagnum Sections : Hemitheca, Isocladus, and Subsecunda / Jonathan Shaw in The Bryologist, vol. 107, n°2 (Eté 2004)
Titre : Phylogenetic Relationships among Sphagnum Sections : Hemitheca, Isocladus, and Subsecunda Type de document : Livre Auteurs : Jonathan Shaw, Auteur ; C. Cox, Auteur ; Sandra Boles, Auteur Année de publication : 2004 Article en page(s) : pp. 189-196 Langues : Anglais Mots-clés : Plant cells Taxa Phylogenetics Phylogeny population génétique Hyalin Branches Genetic loci Solar fibrils gamétophyte Résumé : "Sphagnum macrophyllum, S. pylaesii, and S. cyclophyllum are morphologically atypical in the genus Sphagnum and their systematic placement has been a source of controversy. The first is generally classified in the mono-specific section Isocladus, and the second as section Hemitheca. Sphagnum cyclophyllum is classified in the section Subsecunda, but several authors have hypothesized a close relationship between all three species. Nucleotide sequences from eight nuclear and chloroplast loci were obtained to test hypotheses about relationships among these taxa. Phylogenetic analyses resolve these species (along with S. microcarpum, closely related to S. cyclophyllum) in a well-supported monophyletic group within the section Subsecunda. Sphagnum macrophyllum is sister to S. cyclophyllum, S. microcarpum, and S. pylaesii. Sphagnum cyclophyllum and S. microcarpum form a clade that is sister to S. pylaesii. Two mutually monophyletic groups of populations are resolved within S. pylaesii, one including the European populations and the other including populations from eastern North America and South America. The European populations are almost identical at the nucleotide sequence level whereas the American populations are genetically diverse. Short, delicate pseudopodia; exceptionally large opercula; and an absence or near absence of pseudostomata appear to be synapomorphies for the clade containing S. macrophyllum, S. microcarpum, S. cyclophyllum, and S. pylaesii." Type de publication : périodique Référence biblio : Shaw J., Cox C., Boles S., 2004 - Phylogenetic Relationships among Sphagnum Sections : Hemitheca, Isocladus, and Subsecunda. The Bryologist, 107 (2) : 189-196. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66079
in The Bryologist > vol. 107, n°2 (Eté 2004) . - pp. 189-196[article]Exemplaires
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Titre : The Genus Crypsis (Gramineae) in the United States Type de document : Livre Auteurs : Barry Hammel, Auteur ; John Reeder, Auteur Année de publication : 1979 Article en page(s) : pp. 267-280 Langues : Anglais Mots-clés : graine Flora Taxa Plants Spikelets Lake water chromosome Glume Résumé : "The Old World grass genus, Crypsis, is represented in the United States by three naturalized taxa. Although these are usually treated as specifically distinct in America, European botanists consider two of them to be merely different growth forms of the same species. The few chromosome counts in the literature suggest x = 9 as the basic number. Our studies, including chromosome counts from 44 populations and seed protein analyses from 32 populations, demonstrate that the three taxa differ chemically and represent a polyploid series with a diploid, a tetraploid, and a hexaploid, and a basic chromosome number of x = 8. Each entity seems specifically distinct, and can be recognized by small, but consistent morphological characteristics. Evidence is presented indicating that the correct name for the species listed as C. niliaca in Hitchcock's Manual is Crypsis vaginiflora (Forsk.) Opiz." Type de publication : périodique Référence biblio : Hammel B., Reeder J., 1979 - The Genus Crypsis (Gramineae) in the United States. Systematic Botany, 4 (4) : 267-280. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66121
in Systematic Botany > vol. 4, n°4 (Année 1979) . - pp. 267-280[article]Exemplaires
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Titre : Disjunctions in Bryophytes Type de document : Livre Auteurs : Wilfred Borden Schofield, Auteur ; Howard Crum, Auteur Année de publication : 1973 Article en page(s) : pp. 174-202 Langues : Anglais Mots-clés : Taxa Flora Maps Spore dispersal Mosses Spores Continental drift Plants Liverworts Type de publication : périodique Référence biblio : Schofield W., Crum H., 1973 - Disjunctions in Bryophytes. Annals of the Missouri Botanical Garden, 59 : 174-202. DOI : 10.2307/2394752 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66029
in Annals of the Missouri Botanical Garden > vol. 59 (Année 1972) . - pp. 174-202[article]Exemplaires
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