Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 28 for “"Orchidaceae"”.
-
Systematic studies on the subtribe Disinae (Orchidaceae)
The subtribe Disinae (Orchidaceae) has been revised over its whole distribution range (Sub-Saharan Africa and including the Yemen, Madagascar and Reunion). One hundred and sixty-five species arranged in 5 genera are recognized. Three new subspecies, 12 new species, 18 new series, 8 new sections and …
-
Anatomia floral do gênero Barbosella Schltr. (Orchidaceae: Pleurothallidinae)
Resumo: As orquídeas podem atrair seus polinizadores através de sinais visuais e olfatórios, sem de fato oferecer algum tipo de recompensa, caracterizando esse mecanismo como polinização por engodo. Outras orquídeas podem apresentar osmóforos e nectários, como estruturas secretoras relacionadas com …
-
SUBSTRATOS ALTERNATIVOS NA ACLIMATIZAÇÃO DE Phargmipedium sargentianum ROLFE (ORCHIDACEAE)
Phragmipedium sargentianum, a terrestrial species, endemic to the Atlantic Forest, a species in the list of endangered species in Brazil. In this study experiments were carried out with a view to seeking a proposal for use of alternative substrates for Sphagnum, in the development of seedlings P. …
-
The structure of the perennial growth of Disa uniflora Berg. (Orchidaceae)
The perennation of orchids is poorly understood, in particular that of the Orchidoidae. The understanding of perennation in the Orchidoidae is important because the root-stem tuberoid is used as the one character defining the Orchidoidae as a monophyletic group. The root-stem tuberoid has never …
-
A revision of the South African species of Holothrix Rich. ex Lindl. (Orchidaceae)
The genus Holothrix in South Africa is desc.ribe.d and its taxonomic history discussed. The results of using a computer to draw up a key and a dendrogram of the species are briefly discussed, as are some of the problems experienced. Various morphological characters are evaluated for their …
-
Studies of the South African species of Eulophia R. Br. ex. Lindl. (Orchidaceae)
… members of the genus Eulophia R.Br. ex Lindl. (Orchidaceae). To obtain data for delimiting and giving rank to taxa, studies were made of morphological variation, geographical distribution, cytology and ecology.
-
The embryology, seed coat, and conservation of some Kenyan species of the orchidaceae
Aspects of embryology, seed morphological features and symbiotic seed germination of the Kenyan orchid species of the subfamily Epidendroideae were examined critically in order to elucidate their development and importance in conservation. The embryology of ca. 70 species was studied by …
-
Systematic implications of leaf anatomy and palynology in the Disinae and Coryciinae (Orchidaceae)
Pollen morphology of 8 species (TEM), 86 species (SEM), and leaf anatomy of 62 species (LM), were surveyed in the Oisinae, Coryclinae and, as outgroup taxa, the Orchideae and Satyriinae. Characters extracted from observations made of leaf anatomy and pollen were analysed using cladistic methods, …
-
Investigating the ecology of partial and full myco-heterotrophy among Orchidaceae and Ericaceae using the stable isotope natural abundance analysis approach
… of all known myco-heterotrophic species, the Orchidaceae are the most successful family among myco-heterotrophic plants. All orchids are myco-heterotrophic during their juvenile belowground phases but most species develop green leaves as adults. A similar situation occurs in the tribe Pyroleae …
-
Studies in the genus Eulophia R. Br.
… of 23 species of the genus Eulopbia R. Br. (Orchidaceae) indicate that six taxa may be upheld as distinct species, together with two or possibly three intraspecific taxa, whose status can only be assessed on the basis of further field work. It is considered highly likely that the remaining 17 …
-
Composición y distribución de plantas vasculares epífitas en la cuenca de Laguna Caldera, San Juan Opico,la Libertad, El Salvador
… Las familias más ricas en especies fueron Orchidaceae (10), Bromeliaceae (5), Polypodiaceae (4), Bignoniaceae (3). Las especies Tillandsia remota (Bromeliaceae), Epidendrum stamfordianum (Orchidaceae) y Philodendron jacquinii (Araceae), presentaron el valor de importancia más alto
-
Plants as biotic indicators of Neogene palaeoenvironmental evolution in the Cape Floristic Region
… plant families of the Cape flora (Asteraceae, Orchidaceae, Restionaceae, Cyperaceae, Poaceae and Proteaceae) to infer (i) the relative roles of climatic changes and neotectonic uplift in shaping the CFR since the Early Miocene, and to detemine (ii) whether contrasting evolutionary processes …
-
Assessment of the microbiome associated with endangered orchids
The Orchidaceae (orchid family) is perhaps the most speciose group of flowering plants with approximately 25,000 described species and many thousands of hybrids. While certain mycorrhizal fungi are required for orchids to germinate, these mycorrhizae form just part of a microbial community that …
-
The phylogeny of Brachycorythis Lindl. and Neobolusia Schltr
… the African genera of Orchidinae - Orchideae - Orchidaceae (Schwartzkopffia, Brachycorythis, Neobolusia, Schizochilus, Dracomonticola, Holothrix and Bartholina is estimated with special attention to phylogenetic positions of Brachycorythis and Neobolusia. Pollen surfaces of twelve of the species …
-
Impacts of habitat management on translocation of the rare terrestrial herb Platanthera integrilabia
The Orchidaceae family is characterized by high rates of species rarity and extinction. Translocation efforts are becoming widely used as a means to bolster rare species numbers in situ and are most effective when species habitat requirements are well understood. Platanthera integrilabia is a rare …
-
Evaluating the Evolutionary and Genetic Relationships of the Andean Orchids of Northwestern Ecuador
… <em>rbcL</em> DNA Barcodes representing over 33 Orchidaceae genera. Sequence analysis shows percent species resolution was higher for <em>matK</em> (98.8%) than <em>rbc</em>L (70.24%), with a large portion of the unresolved species for the <em>rbcL</em> loci coming from taxonomically complex …
-
The Last Stand of Angraecum: Biogeographic and Evolutionary History of Darwin's Muses
<p>The Orchidaceae are notable for their remarkable diversity and are regarded as one of the most charismatic families of flowering plants. Notwithstanding the biological significance of Orchidaceae, numerous systematic challenges persist. Inter- and intrageneric relationships in several tribes and …
-
Phenological responses of British orchids and their pollinators to climate change: an assessment using herbarium and museum collections
… museum records, natural history collections, Orchidaceae, phenology
-
Dinamiche di speciazione e dispersione delle Orchidee mediterranee in condizioni di insularità
… Mediterraneo occidentale, in particolare per le Orchidaceae che ospitano, ma mancano ancora evidenze scientifiche che chiariscano quanta parte di questa biodiversità sia dovuta ad eventi di colonizzazione (più o meno recenti) e/o lunghi periodi di isolamento, soprattutto alla luce di ipotesi, …
Page 1 of 2