Journal ArticleAmerican journal of botany · October 2023
PremiseAlthough Boechera (Boechereae, Brassicaceae) has become a plant model system for both ecological genomics and evolutionary biology, all previous phylogenetic studies have had limited success in resolving species relationships within the gen ...
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Journal ArticleAmerican Fern Journal · June 16, 2023
Abstract . Anthropogenic climate change is projected to have an especially negative impact on the survival of plants that are dependent on limited microclimatic refugia or that already reside at their climatic extreme. Gymnocarpium appalachianum is a narro ...
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Journal ArticleAmerican journal of botany · March 2023
PremisePreviously published evidence suggests that Draba maguirei, a mustard endemic to a few localities in the Bear River, Wellsville, and Wasatch Mountains of northern Utah, may represent a cryptic species complex rather than a single species. C ...
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Journal ArticleSystematic botany. · September 2022
Myriopteris scabra (until recently called Cheilanthes horridula) is a xeric-adapted fern species, endemic to the southwestern United States and northern Mexico. It is one of the most recognizable ferns in North America due to the unusual nature of the indu ...
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Journal ArticleAmerican journal of botany · May 2022
PremiseThe taxonomic status of Wright's cliff brake fern, Pellaea wrightiana, has been in dispute ever since it was first described by Hooker in 1858. Previously published evidence suggested that this "taxon" may represent a polyploid complex rath ...
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Journal ArticleJournal of the Botanical Research Institute of Texas · January 1, 2022
Two recently analyzed collections of Cystopteris from New Mexico represent the first records of Utah fragile fern for the state. Our morphological reexamination of this taxon reveals a single character (the thickness of lateral cell walls in rhizome and pe ...
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Journal ArticleJournal of the Botanical Research Institute of Texas · January 1, 2022
To provide a nomenclatural foundation for the treatment of Boechera in the soon-to-be-published Flora of New Mexico, we here discuss the current taxonomic situation in the genus, name three new species (B. austromontana, B. pseudoconsanguinea, and B. quadr ...
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Journal ArticleAmerican Fern Journal. · November 2021
Glacier National Park encompasses over one million acres in the mountains of northwestern Montana, along the United States–Canada border. Our survey of online databases indicates that the earliest extant fern and lycophyte collections from this area were t ...
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Journal ArticleSystematic botany. · August 2021
Ongoing research on the taxonomically complex genus Cheilanthes (Pteridaceae; Cheilanthoideae) has resulted in the identification of a new species from Loja Province in Ecuador, Cheilanthes ecuadorensis, described and illustrated herein. Originally collect ...
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Journal ArticleAmerican journal of botany · May 2021
PremiseRecent studies of plant RNA editing have demonstrated that the number of editing sites can vary widely among large taxonomic groups (orders, families). Yet, very little is known about intrageneric variation in frequency of plant RNA editing ...
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Journal ArticleAmerican journal of botany · February 2021
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PremiseXeric environments impose major constraints on the fern life cycle, yet many lineages overcome these limitations by evolving apomixis. Here, we synthesize studies of apomixis in ferns and present an evidence-based model for the evolution an ...
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Journal ArticleApplications in plant sciences · June 2020
PremiseDespite the economic significance of insect damage to plants (i.e., herbivory), long-term data documenting changes in herbivory are limited. Millions of pressed plant specimens are now available online and can be used to collect big data on ...
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Journal ArticleNat Commun · June 14, 2019
Phytochromes initiate chloroplast biogenesis by activating genes encoding the photosynthetic apparatus, including photosynthesis-associated plastid-encoded genes (PhAPGs). PhAPGs are transcribed by a bacterial-type RNA polymerase (PEP), but how phytochrome ...
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Journal ArticleGigascience · September 2014
Ferns are the only major lineage of vascular plants not represented by a sequenced nuclear genome. This lack of genome sequence information significantly impedes our ability to understand and reconstruct genome evolution not only in ferns, but across all l ...
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Journal ArticleGigaScience · January 2014
Much of science progresses within the tight boundaries of what is often seen as a "black box". Though familiar to funding agencies, researchers and the academic journals they publish in, it is an entity that outsiders rarely get to peek into. Crowdfunding ...
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Journal ArticleAmerican journal of botany · November 2012
Premise of the studyMolecular studies have shown that multiple origins of polyploid taxa are the rule rather than the exception. To understand the distribution and ecology of polyploid species and the evolutionary significance of polyploidy in gen ...
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Journal ArticleAmerican journal of botany · June 2012
Premise of the studyNot all ferns grow in moist, shaded habitats; some lineages thrive in exposed, seasonally dry environments. Notholaenids are a clade of xeric-adapted ferns commonly characterized by the presence of a waxy exudate, called farina ...
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Journal ArticleSystematic biology · May 2012
Backbone relationships within the large eupolypod II clade, which includes nearly a third of extant fern species, have resisted elucidation by both molecular and morphological data. Earlier studies suggest that much of the phylogenetic intractability of th ...
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Journal ArticleMolecular ecology resources · November 2010
Using cheilanthoid ferns, we provide an example of how DNA barcoding approaches can be useful to the horticultural community for keeping plants in the trade accurately identified. We use plastid rbcL, atpA, and trnG-R sequence data to demonstrate that a fe ...
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Journal ArticleEvolution; international journal of organic evolution · September 2010
Molecular rate heterogeneity, whereby rates of molecular evolution vary among groups of organisms, is a well-documented phenomenon. Nonetheless, its causes are poorly understood. For animals, generation time is frequently cited because longer-lived species ...
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Journal ArticleSystematic botany. · April 2010
Polyploidy presents a challenge to those wishing to delimit the species within a group and reconstruct the phylogenetic relationships among these taxa. A clear understanding of the tree-like relationships among the diploid species can provide a framework u ...
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Chapter · January 1, 2008
Introduction As a consequence of employing DNA sequence data and phylogenetic approaches, unprecedented progress has been made in recent years toward a full understanding of the fern tree of life. At the broadest level, molecular phylogenetic analyses have ...
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Journal ArticleAmerican journal of botany · October 2004
The phylogenetic structure of ferns (= monilophytes) is explored here, with a special focus on the early divergences among leptosporangiate lineages. Despite considerable progress in our understanding of fern relationships, a rigorous and comprehensive ana ...
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Journal ArticleNature · April 2004
The rise of angiosperms during the Cretaceous period is often portrayed as coincident with a dramatic drop in the diversity and abundance of many seed-free vascular plant lineages, including ferns. This has led to the widespread belief that ferns, once a p ...
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Journal ArticleInternational journal of plant sciences. · September 2003
In order to estimate evolutionary relationships within the filmy fern genus Trichomanes (Hymenophyllaceae), we performed a phylogenetic analysis using rbcL nucleotide data from 46 species of Trichomanes belonging to all four of C. V. Morton's subgenera: Ac ...
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Journal ArticleInternational journal of plant sciences. · September 2003
Equisetum is a small and morphologically distinct genus with a rich fossil record. Two subgenera have been recognized based principally on stomatal position and stem branching: subg. Equisetum (eight species; superficial stomates; stems branched) and subg. ...
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Journal ArticleTrends in plant science · December 2002
Recent comparative DNA-sequencing studies of chloroplast, mitochondrial and ribosomal genes have produced an evolutionary tree relating the diversity of green-plant lineages. By coupling this phylogenetic framework to the explosion of information on genome ...
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Journal ArticleInternational journal of plant sciences. · July 2002
Spores of the aquatic heterosporous fern family Marsileaceae differ markedly from spores of Salviniaceae, the only other family of heterosporous ferns and sister group to Marsileaceae, and from spores of all homosporous ferns. The marsileaceous outer spore ...
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Journal ArticleSystematic Botany · October 11, 2001
We describe and illustrate Metaxya lanosa, the second known species in the genus and the fern family Metaxyaceae (Pteridophyta). It is currently known from four different watersheds in Amazonian Peru and Venezuela. It can be distinguished readily from M. r ...
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Journal ArticleAmerican journal of botany · June 2001
The "filmy fern" family, Hymenophyllaceae, is traditionally partitioned into two principal genera, Trichomanes s.l. (sensu lato) and Hymenophyllum s.l., based upon sorus shape characters. This basic split in the family has been widely debated this past cen ...
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Journal ArticleNature · February 2001
Most of the 470-million-year history of plants on land belongs to bryophytes, pteridophytes and gymnosperms, which eventually yielded to the ecological dominance by angiosperms 90 Myr ago. Our knowledge of angiosperm phylogeny, particularly the branching o ...
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Journal ArticleInternational Journal of Plant Sciences · January 1, 2000
A new species provisionally assigned to the extant genus Regnellidium Lindm. (Regnellidium upatoiensis sp. nov.) is established for isolated sporocarps assignable to the heterosporous water fern family Marsileaceae. Three sporocarps and hundreds of dispers ...
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Journal ArticleInternational journal of plant sciences. · September 1999
Recent phylogenetic studies have provided compelling evidence that confirms the once disputed hypothesis of monophyly for heterosporous leptosporangiate ferns (Marsileaceae and Salviniaceae). Hypotheses for relationships among the three genera of Marsileac ...
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Journal ArticleThe Journal of eukaryotic microbiology · July 1999
Small subunit rRNA sequence data were generated for 27 strains of cyanobacteria and incorporated into a phylogenetic analysis of 1,377 aligned sequence positions from a diverse sampling of 53 cyanobacteria and 10 photosynthetic plastids. Tree inference was ...
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Journal ArticlePlant Systematics and Evolution · January 1, 1999
Nucleotide sequences from rbcL were used to infer relationships of Lophosoriaceae and Hymenophyllopsidaceae. The phylogenetic positions of these two monotypic fern families have been debated, and neither group had been included in recent molecular systemat ...
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Journal ArticleSystematic botany. · January 1993
A critical examination of isozyme, chromosomal, and morphological characters in subspecies formerly included in Gymnocarpium dryopteris demonstrated that three sexual taxa can be distinguished. We recognize these taxa as distinct species: the widespread, f ...
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Journal ArticleCanadian Journal of Botany · January 1, 1989
Four species and 2 varieties of these native woodland umbellifers are recognized. A key to the taxa, comparative descriptions of diagnostic characters, and notes on the taxonomy, distribution, habitat, and rare status are provided. Eastern Canadian dot map ...
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Journal ArticleTAXON · February 1985
SummaryIt is concluded that Phegopteris Fée (Thelypteridaceae) is an apparently nomenclaturally superfluous name, because, when published, it included what is now established to be the type of
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Journal ArticleCanadian Journal of Botany · October 1, 1983
As part of a systematic investigation of the genus Gymnocarpium in North America, a survey of chromatographic profiles in species and hybrids of the genus was initiated. It was established through cluster analysis and ordination of the phenolic da ...
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Journal ArticleCanadian Journal of Botany · February 1, 1983
Scanning electron microscopy was used to examine the variation in perispore characters within and between six currently recognized taxa of the genus Gymnocarpium Newm. in North America. Representative scanning electron micrographs are presented an ...
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