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The Hedwigia ciliata complex in Sweden, with notes on the occurrence of the taxa in Fennoscandia / Lars Hedenäs in Journal of Bryology, vol. 18,, n°1 (Année 1994)

Public [article]  inJournal of Bryology > vol. 18,, n°1 (Année 1994) . - pp. 139-157 Titre : The Hedwigia ciliata complex in Sweden, with notes on the occurrence of the taxa in Fennoscandia Type de document : texte imprimé Auteurs : Lars Hedenäs, Auteur Année de publication : 1994 Article en page(s) : pp. 139-157 Langues : Anglais (eng) Catégories : [ZG] Suède [Thèmes] Bryophytes [Thèmes] Morphologie végétale Mots-clés : Hedwigia ciliata  Hedwigia stellata  Hedwigia ciliata var. leucophaea  comparaison d'espèce  description botanique Résumé : "The Swedish taxa of the Hedwigia ciliata complex are revised. In Sweden and Fennoscandia, there are three taxa, Hedwigia stellata Hedenäs, sp. nov., H. ciliata (Hedw.) Ehrh. ex P. Beauv. var. ciliata and H. ciliata var. leucophaea B., S. & G. Hedwigia stellata is recognized by its mostly recurved or reflexed leaf apices in the upper sterile shoots when dry, its sharply pointed leaf apex and its uni- or occasionally bi-papillose median leaf cells, with pelt ate papillae on the abaxial side. In both varieties of H. ciliata the leaf apices are erect to patent (occasionally spreading) or following the leaf curvature when dry, many or most leaf apices are truncate or pluripapillose and the median leaf cells are 1-4(-5)- papillose, with most cells having more than one papilla and the papillae are not peltate. Hedwigia ciliata var. ciliata differs from H. ciliata var. leucophaea in the length of the hair-point ((4-)7-33% versus (15-)22-55(-65)% of leaf length), in having less strongly papillose hair-points (macroscopically appearing greyer in var. ciliata than in var. leucophaea), in having more strongly recurved stem leaf margins than the latter and in having slightly larger spores ((23-)25-35 μm versus 19.5-28(-30)μm). Hedwigia ciliata var. ciliata occurs throughout Sweden whereas H. ciliata var. leucophaea is found in the north and in the mountains and H. stellata is known from the southern parts only." (source : auteur) Type de publication : périodique Référence biblio : Hedenäs L., 1994 - The Hedwigia ciliata complex in Sweden, with notes on the occurrence of the taxa in Fennoscandia. Journal of Bryology, 18 (1) : 139-157. ID PMB : 71509 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71509 [article]

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Phylogenetic reconstructions of the Hedwigiaceae reveal cryptic speciation and hybridisation in Hedwigia / Volker Buchbender in Bryophyte Diversity and Evolution, vol. 36, n°1 (Année 2014)

Public [article]  inBryophyte Diversity and Evolution > vol. 36, n°1 (Année 2014) . - pp. 1-21 Titre : Phylogenetic reconstructions of the Hedwigiaceae reveal cryptic speciation and hybridisation in Hedwigia Type de document : texte imprimé Auteurs : Volker Buchbender, Auteur ; Helena Hespanhol, Auteur ; Michael Krug, Auteur ; Cecilia Sérgio, Auteur ; Ana Séneca, Auteur ; Karola Maul, Auteur ; Lars Hedenäs, Auteur ; Dietmar Quandt, Auteur Année de publication : 2014 Article en page(s) : pp. 1-21 Langues : Anglais (eng) Catégories : [ZG] Europe [Thèmes] Bryophytes [Thèmes] Morphologie végétale Mots-clés : Hedwigia ciliata  Hedwigia leucophaea  Hedwigia stellata  Hedwigia striata  phylogénétique moléculaire Résumé : "A molecular based study of relationships in the Hedwigiaceae, with a special focus on the genus Hedwigia in Europe was carried out. A combined approach using sequence data from all three genomes, information obtained from the secondary structures of the nad5 group I intron, and morphological data was performed in order to clarify species concepts in the Hedwigia ciliata-complex. In agreement with earlier studies the separation of Rhacocarpus in its own family Rhacocarpaceae can be rejected. The genus is related to Braunia and therefore clearly belongs to the Hedwigiaceae. Based on molecular data Pseudobraunia californica is shown to be related to Hedwigia. Since several of the morphological characters are of questionable systematic value and the remaining characters are few, a separation in its own genus is inappropriate. We transfer Pseudobraunia californica back to Hedwigia californica. We show that the Hedwigia ciliata-complex in Europe consists of at least 4 species, Hedwigia ciliata, Hedwigia stellata, Hedwigia striata (which is here transferred back to species rank) and a cryptic species of which we do not have enough information yet to identify it as one of the existing taxa or as a new species. All Australian specimens included in our analyses, which were believed to be Hedwigia ciliata s. str., belong to this taxon rendering the occurrence of Hedwigia ciliata s. str. in Australia questionable. Hedwigia ciliata var. leucophaea cannot be maintained with its current morphological circumscription. The distinguishing characters can obviously be developed independently in some taxa of the Hedwigia ciliata complex. Furthermore we found evidence for potential hybridisation in some of the specimens determined as Hedwigia ciliata var. leucophaea, as nuclear and organellar DNA is originating from different taxa. Based on the presented results, Hedwigia striata (Wilson) Bosw. is recognized as a distinct species with more or less distinctly plicate leaves and straight rather than flexuose perichaetial leaf cilia." (source : auteurs) Type de publication : périodique Référence biblio : Buchbender V., Hespanhol H., Krug M., Sérgio C., Séneca A., Maul K., Hedenäs L., Quandt D., 2014 - Phylogenetic reconstructions of the Hedwigiaceae reveal cryptic speciation and hybridisation in Hedwigia. Bryophyte Diversity and Evolution, 36 (1) : 1-21. ID PMB : 71508 DOI : 10.11646/bde.36.1.1 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71508 [article]

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