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An unusual form of Huperzia selago (Lycopodiaceae) and its implications for gemma homology in the genus / Weston Testo in American Fern Journal, vol. 105, n°2 (Année 2015)

Public [article]  inAmerican Fern Journal > vol. 105, n°2 (Année 2015) . - pp. 123-126 Titre : An unusual form of Huperzia selago (Lycopodiaceae) and its implications for gemma homology in the genus Type de document : texte imprimé Auteurs : Weston Testo, Auteur ; Lynden Gerdes, Auteur Année de publication : 2015 Article en page(s) : pp. 123-126 Langues : Anglais (eng) Mots-clés : Huperzia Résumé : "Uniquely among lycophytes, members of thegenusHuperzia(Lycopodiaceae) are characterized by the presence of asexualpropagules borne along the shoot axis. These are highly organized structuresconsisting of a base, known as the gemmiphore, that is six-leaved andpersistent, and an apical portion known as the gemma. This latter portioncomprises six decussately arranged, food-storing leaves enclosing a minuteterminal shoot. This apical portion disperses by abscission from thegemmiphore. These gemmiphore-gemmae structures (hereafter referred tosimply as ‘‘gemmae’’) are distributed along the plant’s main shoots and arethought to be dispersed by rain or wind. Gemmae are important in forming andmaintainingHuperziapopulations and contribute to the commonness ofinterspecific hybrids, which lack viable spores (Wagner and Beitel,inFlora ofNorth America. Editorial Committee, eds. 1993+Flora of North America Northof Mexico. New York and Oxford. 2:20–21. 1993; Reutter, Amer. Fern J. 77:50–57. 1987)." Type de publication : périodique Référence biblio : Testo W., Gerdes L., 2015 - An unusual form of Huperzia selago (Lycopodiaceae) and its implications for gemma homology in the genus. American Fern Journal, 105 (2) : 123-126. DOI : 10.1640/amfj-105-02-123-126.1 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66634 [article]

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Huperzia continentalis (Lycopodiaceae), a New Species of Gemmiferous Firmoss Separated from Huperzia haleakalae / Weston Testo in Systematic Botany, vol. 41, n°4 (Année 2016)

Public [article]  inSystematic Botany > vol. 41, n°4 (Année 2016) . - pp. 894-901 Titre : Huperzia continentalis (Lycopodiaceae), a New Species of Gemmiferous Firmoss Separated from Huperzia haleakalae Type de document : texte imprimé Auteurs : Weston Testo, Auteur ; Arthur Haines, Auteur ; Arthur V. Gilman, Auteur Année de publication : 2016 Article en page(s) : pp. 894-901 Langues : Anglais (eng) Catégories : [ZG] Hawaï [Espèces (in biblio)] Huperzia Mots-clés : espèce végétale circumboréale Résumé : "A new species of gemmiferous clubmoss, Huperzia continentalis, is described. This species is most abundant in northwestern North America, but also occurs in Greenland, northern Europe, and northeastern Siberia. Material of this species was previously treated as Huperzia haleakalae, but detailed morphological study shows that the species differ by color, leaf size and shape, and gemma distribution. With the recognition of Huperzia continentalis, H. haleakalae is only known from the type, collected on Maui in 1840, and is likely extinct. Huperzia continentalis is also compared to similar species of Huperzia with which it co-occurs; it is readily distinguished from these taxa by plant size, leaf dimensions, and the size and distribution of gemmae. Hybrids between H. continentalis and four other Huperzia species are discussed." (source : auteurs) Type de publication : périodique Référence biblio : Testo W., Haines A., Gilman A., 2016 - Huperzia continentalis (Lycopodiaceae), a New Species of Gemmiferous Firmoss Separated from Huperzia haleakalae. Systematic Botany, 41 (4) : 894-901. ID PMB : 65319 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65319 [article]

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Use of Gemma Characters to Identify North American Huperzia (Lycopodiaceae) / Arthur V. Gilman in American Fern Journal, vol. 105, n°3 (Année 2015)

Public [article]  inAmerican Fern Journal > vol. 105, n°3 (Année 2015) . - pp. 145-161 Titre : Use of Gemma Characters to Identify North American Huperzia (Lycopodiaceae) Type de document : texte imprimé Auteurs : Arthur V. Gilman, Auteur ; Weston Testo, Auteur Année de publication : 2015 Article en page(s) : pp. 145-161 Langues : Anglais (eng) Mots-clés : Huperzia Résumé : "All North American firmosses (Huperzia: Lycopodiaceae) produce highly specialized vegetative propagules known as gemmae. Though gemmae are of interest to morphologists, they have been used only rarely as aids in identification. To improve understanding of their variation among North American species and to explore their systematic utility we surveyed gemmae of all species in North America north of Mexico and provide measurements, comparative descriptions, and images. Several characters of the gemmae, including their size, shape, and morphology of the leaves that comprise them vary considerably across the species studied and can be used to distinguish species. A dichotomous key based on gemma characters is provided, and several notable range expansions are reported. We anticipate this study will help resolve confusion regarding the identity of North American Huperzia species, particularly among the taxa in the northern and western regions of the continent, which remain poorly understood." Type de publication : périodique Référence biblio : Gilman A., Testo W., 2015 - Use of Gemma Characters to Identify North American Huperzia (Lycopodiaceae). American Fern Journal, 105 (3) : 145-161. DOI : 10.1640/0002-8444-105.3.145 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66635 [article]

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