| Abstract Detail
Pteridological Section/AFS Sprunt, Susan V [1], Schneider, Harald [2], Watson, Linda E. [1], Russell, Stephen J. [3], Hickey, R. James [1]. Phylogeography and taxonomy of the widespread resurrection fern species Pleopeltis polypodioides. Pleopeltis polypodioides is a common epiphytic fern species that occurs in the southern United States and throughout Central America, the Caribbean Basin, tropical South America, with a disjunct subspecies in southern Africa. This species is known for the poikilohydrous strategy, i.e. the re-hydration of leaves, that allows for the colonization of epiphytic habitats despite considerable drought stress. Up to seven subspecies or varieties are recognized within P. polypodioides: polypodioides, michauxiana, acicularis, burchellii, minus, ecklonii, and knoblochianum. Molecular phylogenetics is being used to understand the systematic relationships within P. polypodioides. Six of the seven subspecies were sampled representing a total of 83 collections. DNA sequences of two plastid regions, trnL-trnF region including the trnL intron and the trnL-trnF intergenic spacer, and the psbA-trnH intergenic spacer were generated and analyzed independently, and combined using parsimony. Our preliminary results indicate that P. polypodioides is likely monophyletic and suggests the presence of two lineages: a South American Caribbean Basin group and a Central and North American group. The African subspecies (P. polypodioides subsp. ecklonii) appears to be closely related to the Central American lineage. Log in to add this item to your schedule
1 - Miami University, Department of Botany, Oxford, Ohio, 45056, USA 2 - Natural History Museum, Cromwell Road, London, SW7 5BD, UK 3 - Natural History Museum, Department of Botany, Cromwell road, London, SW7 5BD, United Kingdom
Keywords: phylogeny epiphytic Pleopeltis Pleopeltis polypodioides trnL-trnF psbA-trnH ferns.
Presentation Type: Oral Paper:Papers for Sections Session: 23 Location: 209/SUB Date: Monday, July 28th, 2008 Time: 3:15 PM Number: 23006 Abstract ID:345 |