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Toward a monophyletic Notholaena (Pteridaceae): Resolving patterns of evolutionary convergence in xeric-adapted ferns

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Date
2008-01-01
Authors
Rothfels, CJ
Windham, MD
Grusz, AL
Gastony, GJ
Pryer, KM
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Abstract
Cheilanthoid ferns (Pteridaceae) are a diverse and ecologically important clade, unusual among ferns for their ability to colonize and diversify within xeric habitats. These extreme habitats are thought to drive the extensive evolutionary convergence, and thus morphological homoplasy, that has long thwarted a natural classification of cheilanthoid ferns. Here we present the first multigene phylogeny to focus on taxa traditionally assigned to the large genus Notholaena. New World taxa (Notholaena sensu Tryon) are only distantly related to species occurring in the Old World (Notholaena sensu Pichi Sermolli). The circumscription of Notholaena adopted in recent American floras is shown to be paraphyletic, with species usually assigned to Cheilanthes and Cheiloplecton nested within it. The position of Cheiloplecton is particularly surprising - given its well-developed false indusium and non-farinose blade, it is morphologically anomalous within the "notholaenoids". In addition to clarifying natural relationships, the phylogenetic hypothesis presented here helps to resolve outstanding nomenclatural issues and provides a basis for examining character evolution within this diverse, desert-adapted clade.
Type
Journal article
Subject
Science & Technology
Life Sciences & Biomedicine
Plant Sciences
Evolutionary Biology
atpA
cheilanthoids
Cheiloplecton
ferns
molecular phylogenetics
morphological homoplasy
Paragymnopteris marantae
rbcL
trnG-trnR
BAYESIAN PHYLOGENETIC INFERENCE
CHEILANTHOID FERNS
MORPHOLOGICAL HOMOPLASY
MITOCHONDRIAL GENOMES
SEQUENCES
GENUS
CHLOROPLAST
SWITZERLAND
AFFINITIES
Permalink
https://hdl.handle.net/10161/21802
Published Version (Please cite this version)
10.1002/tax.573005
Publication Info
Rothfels, CJ; Windham, MD; Grusz, AL; Gastony, GJ; & Pryer, KM (2008). Toward a monophyletic Notholaena (Pteridaceae): Resolving patterns of evolutionary convergence in xeric-adapted ferns. Taxon, 57(3). pp. 712-724. 10.1002/tax.573005. Retrieved from https://hdl.handle.net/10161/21802.
This is constructed from limited available data and may be imprecise. To cite this article, please review & use the official citation provided by the journal.
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Scholars@Duke

Pryer

Kathleen M. Pryer

Professor of Biology
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