Vasco, Alejandra , Moran, Robbin .
Systematics and Phylogeny of Elaphoglossum section Lepidoglossa H. Christ (Dryopteridaceae): search for natural groups.
Elaphoglossum is one of the most diverse genera of ferns with ca. 600 species. At the taxonomic level it poses some interesting challenges because its species are similar and the characters that distinguish them typically few and subtle. This morphological similarity has made the recognition of natural groups difficult. As a consequence, taxonomic revision within the genus has been hindered. In 1980, based on morphological evidence, Mickel and Atehortúa proposed an infrageneric classification for Elaphoglossum (9 sections). Recent molecular analyses based on chloroplast sequences (trnL-F, rps4-trnS) retrieved Elaphoglossum as monophyletic and corroborated most of the sections proposed on the basis of morphology. However, those analyses did not explore the relationships within any of the sections recovered. The goals of this study were (1) to explore evolutionary relationships within Elaphoglossum section Lepidoglossa, one of the larger clades recovered by the molecular analyses and recognized on the basis of morphology; and (2) to identify smaller and morphologically well circumscribed monophyletic groups within the section to facilitate their taxonomic revision. Our molecular analyses using three chloroplast markers (atpB-rbcL, rps4-trnS, and trnL-F), corroborated the monophyly of section Lepidoglossa and recovered several monophyletic groups. Two of these groups were chosen for taxonomic revision. The first was the E. ciliatum group. It turned out to have 10 species characterized by laminar scales reduced to minute dots, spiny perispores, and resinous rhizomes. The second was the E. muscosum group. It turned out to have 16 species characterized by flat scales with acicular marginal cells, scaly laminae, and spores about twice as long as other species of Elaphoglossum.
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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
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Alpine B/Snowbird Center
Date: Monday, July 27th, 2009
Time: 8:45 AM