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Auteur Daniel F. Brunton |
Documents disponibles écrits par cet auteur (2)
Affiner la rechercheIsoetes ×jermyi hyb nov. (Isoetaceae), a new quillwort (lycophyte) hybrid from western Europe / Daniel F. Brunton in Botany Letters, 168 (4) (2021)
Titre : Isoetes ×jermyi hyb nov. (Isoetaceae), a new quillwort (lycophyte) hybrid from western Europe Type de document : Imprimé Auteurs : Daniel F. Brunton ; Frederick James Rumsey (1963-) Année de publication : 2021 Article en page(s) : 503-511 Langues : Anglais (eng) Catégories : [Thématique] Eaux douces
[Géographique] EuropeMots-clés : Isoetes ×jermyi Isoëtes echinospora Durieu Isoetes lacustris L. Isoetes × hickeyi Isoëtes morei Résumé : Isoetes ×jermyi, hyb nov. (Isoetaceae), is the sterile hexaploid (6x) hybrid quillwort of diploid (2x) I. echinospora x decaploid (10x) I. lacustris. It has been identified from cytologically confirmed plants at several sites in the western United Kingdom and by the morphological determination of herbarium specimens from sites in north-eastern France and Småland, Sweden. Clarification is provided for the distinctions of 6x I. ×jermyi from the similar, apparently heptaploid (7x) Pyrenean endemic I. ×brochonii and the misapplied 6x North American endemic I. ×hickeyi. The possibility that enigmatic Irish quillwort I. morei could represent this taxon is discussed and rejected. The frequency of its occurrence in the United Kingdom suggests that I. ×jermyi can be expected to occur regularly within mixed I. echinospora and I. lacustris populations across the wide area of north-western Europe where the two species are sympatric. Identifiant pérenne : DOI : 10.1080/23818107.2021.1907223
in Botany Letters > 168 (4) (2021) . - 503-511Brunton, D.F., Rumsey, F.J., 2021 - Isoetes ×jermyi hyb nov. (Isoetaceae), a new quillwort (lycophyte) hybrid from western Europe ; Botany Letters, 168 (4) : 503-511.
Titre : The taxonomy, status and origin of Isoetes ×brochonii and I. creussensis (Isoetaceae), two Pyrenean endemic taxa Type de document : Imprimé Auteurs : Daniel F. Brunton, Auteur ; Paul C. Sokoloff, Auteur ; Pere Aymerich, Auteur Année de publication : 2020 Article en page(s) : 391-408 Langues : Anglais (eng) Catégories : [Thématique] Endémisme
[Thématique] Ptéridophytes, fougères
[Géographique] Europe du Sud
[Géographique] PyrénéesMots-clés : Isoetes brochonii Motelay isoetes creussensis Isoetes echinospora Durieu, 1861 Isoetes lacustris L. Résumé : Isoetes brochonii has possibly been subject to more taxonomic designations over the last century than any other European quillwort and most commonly has been put into synonymy with the widespread I. lacustris. Investigations of herbarium and living material in the present study, however, indicate it to be a sterile (aborted spored) hybrid, I. ×brochonii (pro sp.), confined to high elevation lakes of the Pyrenees mountains in France, Spain and Andorra. This represents the first uniquely European Isoetes hybrid to be described. Putative parents are diploid I. echinospora and dodecaploid I. creussensis, probably a hybridogenic Pyrenean endemic. The speciation of I. creussensis may well have occurred in Pyrenean refugia during Quaternary glacial-interglacial fluctuations. We found no convincing evidence for the occurrences of decaploid I. lacustris in the Pyrenees where it appears to have been confused with I. creussensis. A comparative table of the distinguishing morphological characteristics of I. creussensis and I. lacustris is provided, with megaspore ornamentation and microspore size indicated as being particularly important indicators. Identifiant pérenne : DOI : 10.1080/23818107.2020.1790034
in Botany Letters > 167 (4) (2020) . - 391-408Brunton, D.F., Sokoloff, P.C., Aymerich, P., 2020 - The taxonomy, status and origin of Isoetes ×brochonii and I. creussensis (Isoetaceae), two Pyrenean endemic taxa ; Botany Letters, 167 (4) : 391-408.
