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Browsing by Author "Windham, MD"
Now showing items 1-20 of 27
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A molecular phylogeny of the fern family Pteridaceae: assessing overall relationships and the affinities of previously unsampled genera.
(Molecular phylogenetics and evolution, 2007-09)The monophyletic Pteridaceae accounts for roughly 10% of extant fern diversity and occupies an unusually broad range of ecological niches, including terrestrial, epiphytic, xeric-adapted rupestral, and even aquatic species. ... -
A plastid phylogeny of the cosmopolitan fern family cystopteridaceae (Polypodiopsida)
(Systematic Botany, 2013-06-01)Among the novel results of recent molecular phylogenetic analyses are the unexpectedly close evolutionary relationships of the genera Acystopteris, Cystopteris, and Gymnocarpium, and the phylogenetic isolation of these genera ... -
A step-by-step protocol for meiotic chromosome counts in flowering plants: A powerful and economical technique revisited.
(Applications in plant sciences, 2020-04-23)Premise:Counting chromosomes is a fundamental botanical technique, yet it is often intimidating and increasingly sidestepped. Once mastered, the basic protocol can be applied to a broad range of taxa and research questions. ... -
A Unified Approach to Taxonomic Delimitation in the Fern Genus Pentagramma (Pteridaceae)
(Systematic Botany, 2015-01-01)© Copyright 2015 by the American Society of Plant Taxonomists.The native goldback and silverback ferns of western North America, composing the genus Pentagramma, are phylogenetically isolated within the xeric-adapted cheilanthoid ... -
Are there too many fern genera?
(Taxon, 2018-06-01) -
Baja: A New Monospecific Genus Segregated from Cheilanthes s. l. (Pteridaceae)
(Systematic Botany, 2019-09-06) -
Deciphering the origins of apomictic polyploids in the Cheilanthes yavapensis complex (Pteridaceae).
(American journal of botany, 2009-09)Deciphering species relationships and hybrid origins in polyploid agamic species complexes is notoriously difficult. In this study of cheilanthoid ferns, we demonstrate increased resolving power for clarifying the origins ... -
Do asexual polyploid lineages lead short evolutionary lives? A case study from the fern genus Astrolepis.
(Evolution; international journal of organic evolution, 2011-11)A life-history transition to asexuality is typically viewed as leading to a heightened extinction risk, and a number of studies have evaluated this claim by examining the relative ages of asexual versus closely related sexual ... -
Evidence for reciprocal origins in Polypodium hesperium (Polypodiaceae): a fern model system for investigating how multiple origins shape allopolyploid genomes.
(American journal of botany, 2014-09-17)•Many polyploid species are composed of distinct lineages originating from multiple, independent polyploidization events. In the case of allopolyploids, reciprocal crosses between the same progenitor species can yield lineages ... -
Expression level dominance and homeolog expression bias in recurrent origins of the allopolyploid fern polypodium hesperium
(American Fern Journal, 2019-07-01)© 2019 American Fern Society. All rights reserved. Allopolyploidization is a common mode of speciation in ferns with many taxa having formed recurrently from distinct hybridization events between the same parent species. ... -
Gaga, a new fern genus segregated from cheilanthes (pteridaceae)
(Systematic Botany, 2012-10-01)Ongoing molecular phylogenetic studies of cheilanthoid ferns confirm that the genus Cheilanthes (Pteridaceae) is polyphyletic. A monophyletic group of species within the hemionitid clade informally called the "C. marginata ... -
Infraspecific diversification of the star cloak fern (Notholaena standleyi) in the deserts of the United States and Mexico.
(American journal of botany, 2020-04-07)PREMISE:Not all ferns grow in moist and shaded habitats. One well-known example is Notholaena standleyi, a species that thrives in deserts of the southwestern United States and Mexico. This species exhibits several "chemotypes" ... -
Low-copy nuclear data confirm rampant allopolyploidy in the cystopteridaceae (Polypodiales)
(Taxon, 2014-10-01)© International Association for Plant Taxonomy (IAPT) 2014. Here we present the first nuclear phylogeny for Cystopteridaceae (Polypodiales), using the single-copy locus gapCp “short”. This phylogeny corroborates broad results ... -
Low-copy nuclear sequence data confirm complex patterns of farina evolution in notholaenid ferns (Pteridaceae).
(Molecular phylogenetics and evolution, 2019-09)Notholaenids are an unusual group of ferns that have adapted to, and diversified within, the deserts of Mexico and the southwestern United States. With approximately 40 species, this group is noted for being desiccation-tolerant ... -
Natural hybridization between genera that diverged from each other approximately 60 million years ago.
(Am Nat, 2015-03)A fern from the French Pyrenees-×Cystocarpium roskamianum-is a recently formed intergeneric hybrid between parental lineages that diverged from each other approximately 60 million years ago (mya; 95% highest posterior density: ... -
Patterns of diversification in the xeric-adapted fern genus myriopteris (Pteridaceae)
(Systematic Botany, 2014-01-01)Strong selective pressures imposed by drought-prone habitats have contributed to extensive morphological convergence among the 400 + species of cheilanthoid ferns (Pteridaceae). As a result, generic circumscriptions based ... -
Phylogeny, divergence time estimates, and phylogeography of the diploid species of the polypodium vulgare complex (Polypodiaceae)
(Systematic Botany, 2014-01-01)© 2014 by the American Society of Plant Taxonomists. The Polypodium vulgare complex (Polypodiaceae) comprises a well-studied group of fern taxa whose members are cryptically differentiated morphologically and have generated ... -
rbcL and matK earn two thumbs up as the core DNA barcode for ferns.
(PloS one, 2011-01)BACKGROUND: DNA barcoding will revolutionize our understanding of fern ecology, most especially because the accurate identification of the independent but cryptic gametophyte phase of the fern's life history--an endeavor ... -
Rediscovery of Polypodium calirhiza (Polypodiaceae) in Mexico
(Brittonia, 2014)This study addresses reported discrepancies regarding the occurrence of Polypodium calirhiza in Mexico. The original paper describing this taxon cited collections from Mexico, but the species was omitted from the recent ... -
Rediscovery of Polypodium calirhiza (Polypodiaceae) in Mexico
(Brittonia, 2014-01-01)This study addresses reported discrepancies regarding the occurrence of Polypodium calirhiza in Mexico. The original paper describing this taxon cited collections from Mexico, but the species was omitted from the recent ...
