Vasco, Alejandra , Moran, Robbin , Rouhan, G. .
Taxonomic Revision of the Elaphoglossum ciliatum group (Dryopteridaceae).
With about 600 species, Elaphoglossum is one of the most diverse genera of ferns. It has a Pantropical distribution, the species occurring principally in wet-montane and cloud forests of the Neotropics. Because of its uniformity and large size, difficulties in finding small monophyletic groups within Elaphoglossum has become one reason why up to date monographic studies examining subgroups of this genus have not been published.
Mickel and Atehortúa (1980) proposed an infrageneric classification of Elaphoglossum based entirely on morphological characters. Recent molecular analyses based on chloroplast sequences retrieved Elaphoglossum as monophyletic and corroborated most of the subgroups proposed on the basis of morphology. One of the subgroups recognized on the basis of morphology and supported by the molecular work was sect. Lepidoglossa. Its members typically have conspicuously scaly laminae with the scales bearing acicular marginal cells.
As a result of our molecular analyses, a group of 8 species in sect. Lepidoglossa was supported as monophyletic and formed the basis for this taxonomic revision. These species are informally called the Elaphoglossum ciliatum group. All the species have spiculate spores and abaxial laminar scales reduced to minute dots, the laminae therefore appearing glabrous. These characteristics, however, are found in other species of sect. Lepidoglossa and thus are not unique to the ciliatum-group. Most of the species also have resinous rhizomes. Nine species are recognized, six are neotropical and primarily montane. The other three are endemic to the island of St. Helena in the southern Atlantic Ocean. Our molecular phylogenetic analysis suggests the three species of St. Helena are the result of a single dispersal event from South America.
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1 - The New York Botanical Garden, City University of New York Graduate Center, Bronx, NY, 10458-5126, U.S.A
2 - New York Botanical Garden, Institute of Systematic Botany, 200Th Street & Southern Boulevard, Bronx, New York, 10458-5126, USA
3 - Institut de Recherche pour le Développement US084, Muséum National d’H, 16 rue Buffon, 75005, Paris, France
Presentation Type: Poster:Posters for Sections
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM