Ruhfel, Brad , Lindsay, Stuart , Davis, III, Charles C. .
Phylogenetic Placement of Rheopteris and the Polyphyly of Monogramma (Pteridaceae s.l.): Evidence from rbcL Sequence Data.
Recent molecular investigations have elucidated the generic and subgeneric relationships of most vittarioid genera (Pteridaceae sensu lato pro parte). However, the phylogenetic placement of Monogramma and Rheopteris remain to be examined. The inclusion of Rheopteris cheesmaniae (the sole representative of the genus) in the vittarioids has been questioned since its description half a century ago, and although the placement of Monogramma within the vittarioids is well supported with non-molecular characters, its relationship to other members of the vittarioid clade is unknown. We present new phylogenetic evidence from plastid rbcL sequence data indicating that Rheopteris is strongly supported as a member of the vittarioid clade, and that Monogramma is polyphyletic. Data from molecular and non-molecular characters suggest that Rheopteris and part of Monogramma, i.e., those species previously ascribed to the genus Vaginularia, represent two of the earliest diverging lineages within the vittarioids, and that remaining members of Monogramma are derived from within Haplopteris.
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1 - Harvard University Herbaria, Organismic and Evolutionary Biology, 22 Divinity Avenue, Cambridge, MA, 02138, United States
2 - University of Michigan Herbaria, 3600 Varsity Drive, Ann Arbor, MI, 48108, United States
Presentation Type: Poster:Posters for Sections
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM