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Stephen Mcloughlin - One of the best experts on this subject based on the ideXlab platform.
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Osmunda pulchella sp. nov. from the Jurassic of Sweden—reconciling molecular and fossil evidence in the phylogeny of modern royal ferns (Osmundaceae)
BMC evolutionary biology, 2015Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:The classification of royal ferns (Osmundaceae) has long remained controversial. Recent molecular phylogenies indicate that Osmunda is paraphyletic and needs to be separated into Osmundastrum and Osmunda s.str. Here, however, we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of both Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional Jurassic rhizome species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as probable ancestral members of modern genera and subgenera, which accords with recent evidence from Bayesian dating. Osmunda pulchella is likely a precursor of the Osmundastrum lineage. The recently proposed root placement in Osmundaceae—based solely on molecular data—stems from possibly misinformative outgroup signals in rbcL and atpA genes. We conclude that the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can instead be elegantly reconciled under the assumption that Osmunda is indeed monophyletic.
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Osmunda pulchella sp nov from the jurassic of sweden reconciling molecular and fossil evidence in the phylogeny of modern royal ferns Osmundaceae
BMC Evolutionary Biology, 2015Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:The classification of royal ferns (Osmundaceae) has long remained controversial. Recent molecular phylogenies indicate that Osmunda is paraphyletic and needs to be separated into Osmundastrum and Osmunda s.str. Here, however, we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of both Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional Jurassic rhizome species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as probable ancestral members of modern genera and subgenera, which accords with recent evidence from Bayesian dating. Osmunda pulchella is likely a precursor of the Osmundastrum lineage. The recently proposed root placement in Osmundaceae—based solely on molecular data—stems from possibly misinformative outgroup signals in rbcL and atpA genes. We conclude that the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can instead be elegantly reconciled under the assumption that Osmunda is indeed monophyletic.
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Osmunda pulchella sp. nov. from the Jurassic of Swedenreconciling molecular and fossil evidence in the phylogeny of Osmundaceae
2014Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:The systematic classification of Osmundaceae has long remained controversial. Recent molecular data indicate that Osmunda is paraphyletic, and needs to be separated into Osmundastrum and Osmunda s. str. Here we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional, newly identified Jurassic Osmunda species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as ancestral members of modern genera and subgenera. Altogether, the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can be elegantly reconciled under the assumption that Osmunda is indeed monophyletic; the recently proposed root-placement in Osmundaceaebased solely on molecular datalikely results from un- or misinformative out-group signals.
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a fossil Osmunda from the jurassic of sweden reconciling molecular and fossil evidence in the phylogeny of Osmundaceae
bioRxiv, 2014Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:ABSTRACT The systematic classification of Osmundaceae has long remained controversial. Recent molecular data indicate that Osmunda is paraphyletic, and needs to be separated into Osmundastrum and Osmunda s. str. Here we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional, newly identified Jurassic Osmunda species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as ancestral members of modern genera and subgenera. Altogether, the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can be elegantly reconciled under the assumption that Osmunda is indeed monophyletic; the recently proposed root-placement in Osmundaceae—based solely on molecular data—likely results from un- or misinformative out-group signals.
Guido W. Grimm - One of the best experts on this subject based on the ideXlab platform.
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Osmunda pulchella sp. nov. from the Jurassic of Sweden—reconciling molecular and fossil evidence in the phylogeny of modern royal ferns (Osmundaceae)
BMC evolutionary biology, 2015Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:The classification of royal ferns (Osmundaceae) has long remained controversial. Recent molecular phylogenies indicate that Osmunda is paraphyletic and needs to be separated into Osmundastrum and Osmunda s.str. Here, however, we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of both Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional Jurassic rhizome species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as probable ancestral members of modern genera and subgenera, which accords with recent evidence from Bayesian dating. Osmunda pulchella is likely a precursor of the Osmundastrum lineage. The recently proposed root placement in Osmundaceae—based solely on molecular data—stems from possibly misinformative outgroup signals in rbcL and atpA genes. We conclude that the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can instead be elegantly reconciled under the assumption that Osmunda is indeed monophyletic.
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Osmunda pulchella sp nov from the jurassic of sweden reconciling molecular and fossil evidence in the phylogeny of modern royal ferns Osmundaceae
BMC Evolutionary Biology, 2015Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:The classification of royal ferns (Osmundaceae) has long remained controversial. Recent molecular phylogenies indicate that Osmunda is paraphyletic and needs to be separated into Osmundastrum and Osmunda s.str. Here, however, we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of both Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional Jurassic rhizome species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as probable ancestral members of modern genera and subgenera, which accords with recent evidence from Bayesian dating. Osmunda pulchella is likely a precursor of the Osmundastrum lineage. The recently proposed root placement in Osmundaceae—based solely on molecular data—stems from possibly misinformative outgroup signals in rbcL and atpA genes. We conclude that the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can instead be elegantly reconciled under the assumption that Osmunda is indeed monophyletic.
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Osmunda pulchella sp. nov. from the Jurassic of Swedenreconciling molecular and fossil evidence in the phylogeny of Osmundaceae
2014Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:The systematic classification of Osmundaceae has long remained controversial. Recent molecular data indicate that Osmunda is paraphyletic, and needs to be separated into Osmundastrum and Osmunda s. str. Here we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional, newly identified Jurassic Osmunda species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as ancestral members of modern genera and subgenera. Altogether, the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can be elegantly reconciled under the assumption that Osmunda is indeed monophyletic; the recently proposed root-placement in Osmundaceaebased solely on molecular datalikely results from un- or misinformative out-group signals.
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a fossil Osmunda from the jurassic of sweden reconciling molecular and fossil evidence in the phylogeny of Osmundaceae
bioRxiv, 2014Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:ABSTRACT The systematic classification of Osmundaceae has long remained controversial. Recent molecular data indicate that Osmunda is paraphyletic, and needs to be separated into Osmundastrum and Osmunda s. str. Here we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional, newly identified Jurassic Osmunda species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as ancestral members of modern genera and subgenera. Altogether, the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can be elegantly reconciled under the assumption that Osmunda is indeed monophyletic; the recently proposed root-placement in Osmundaceae—based solely on molecular data—likely results from un- or misinformative out-group signals.
Benjamin Bomfleur - One of the best experts on this subject based on the ideXlab platform.
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Osmunda pulchella sp. nov. from the Jurassic of Sweden—reconciling molecular and fossil evidence in the phylogeny of modern royal ferns (Osmundaceae)
BMC evolutionary biology, 2015Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:The classification of royal ferns (Osmundaceae) has long remained controversial. Recent molecular phylogenies indicate that Osmunda is paraphyletic and needs to be separated into Osmundastrum and Osmunda s.str. Here, however, we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of both Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional Jurassic rhizome species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as probable ancestral members of modern genera and subgenera, which accords with recent evidence from Bayesian dating. Osmunda pulchella is likely a precursor of the Osmundastrum lineage. The recently proposed root placement in Osmundaceae—based solely on molecular data—stems from possibly misinformative outgroup signals in rbcL and atpA genes. We conclude that the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can instead be elegantly reconciled under the assumption that Osmunda is indeed monophyletic.
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Osmunda pulchella sp nov from the jurassic of sweden reconciling molecular and fossil evidence in the phylogeny of modern royal ferns Osmundaceae
BMC Evolutionary Biology, 2015Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:The classification of royal ferns (Osmundaceae) has long remained controversial. Recent molecular phylogenies indicate that Osmunda is paraphyletic and needs to be separated into Osmundastrum and Osmunda s.str. Here, however, we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of both Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional Jurassic rhizome species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as probable ancestral members of modern genera and subgenera, which accords with recent evidence from Bayesian dating. Osmunda pulchella is likely a precursor of the Osmundastrum lineage. The recently proposed root placement in Osmundaceae—based solely on molecular data—stems from possibly misinformative outgroup signals in rbcL and atpA genes. We conclude that the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can instead be elegantly reconciled under the assumption that Osmunda is indeed monophyletic.
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Osmunda pulchella sp. nov. from the Jurassic of Swedenreconciling molecular and fossil evidence in the phylogeny of Osmundaceae
2014Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:The systematic classification of Osmundaceae has long remained controversial. Recent molecular data indicate that Osmunda is paraphyletic, and needs to be separated into Osmundastrum and Osmunda s. str. Here we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional, newly identified Jurassic Osmunda species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as ancestral members of modern genera and subgenera. Altogether, the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can be elegantly reconciled under the assumption that Osmunda is indeed monophyletic; the recently proposed root-placement in Osmundaceaebased solely on molecular datalikely results from un- or misinformative out-group signals.
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a fossil Osmunda from the jurassic of sweden reconciling molecular and fossil evidence in the phylogeny of Osmundaceae
bioRxiv, 2014Co-Authors: Benjamin Bomfleur, Guido W. Grimm, Stephen McloughlinAbstract:ABSTRACT The systematic classification of Osmundaceae has long remained controversial. Recent molecular data indicate that Osmunda is paraphyletic, and needs to be separated into Osmundastrum and Osmunda s. str. Here we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of Osmundastrum and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new morphological matrix based on rhizome anatomy, and used network analyses to establish phylogenetic relationships between fossil and extant members of modern Osmundaceae. We re-analysed the original molecular data to evaluate root-placement support. Finally, we integrated morphological and molecular data-sets using the evolutionary placement algorithm. Osmunda pulchella and five additional, newly identified Jurassic Osmunda species show anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our evolutionary placement analysis identifies fossil species as ancestral members of modern genera and subgenera. Altogether, the seemingly conflicting evidence from morphological, anatomical, molecular, and palaeontological data can be elegantly reconciled under the assumption that Osmunda is indeed monophyletic; the recently proposed root-placement in Osmundaceae—based solely on molecular data—likely results from un- or misinformative out-group signals.
Masahiro Kato - One of the best experts on this subject based on the ideXlab platform.
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A Comparative Morphological Study of Pinnules in the Cenozoic Osmunda Subgenus Osmunda (Osmundaceae): Implications for Its Historical Biogeography and Phylogeny
International Journal of Plant Sciences, 2016Co-Authors: Chie Tsutsumi, Yoko Yatabe-kakugawa, Kazuhiko Uemura, Minoru Tsukagoshi, Masahiro KatoAbstract:Premise of research. Osmunda regalis has a worldwide distribution, except for in eastern Asia, where Osmunda japonica and Osmunda lancea can be found instead. However, the present geographic separation does not necessarily mean geographical speciation. Molecular data indicated that American O. regalis is sister to O. japonica and O. lancea rather than to European O. regalis, but the relationship between the distribution and phylogeny remained unclear. An analysis of vegetative pinnule fossils, which were abundant in the Cenozoic time, would help elucidate the historical biogeography and evolution of these species if the taxonomy of the fossils would be clarified.Methodology. We measured interveinlet intervals in mature and juvenile plants of the extant species and fossils from Japan and the rest of the world, as well as the size of their pinnules, and compared them through geological time and during ontogeny.Pivotal results. The interveinlet interval differs between O. regalis and O. japonica, and part of...
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Molecular Evidence on the Origin of Osmunda ×mildei (Osmundaceae)
American Fern Journal, 2012Co-Authors: C. Tsutsumi, Masahiro Kato, Yoko Yatabe-kakugawa, Y. Hirayama, S-z. ZhangAbstract:Abstract The southern Chinese Osmunda ×mildei has been suggested to be an intersubgeneric hybrid, i.e., O. japonica (subgenus Osmunda) × O. angustifolia (subgenus Plenasium) or O. japonica × O. vachellii (subgenus Plenasium). These interpretations were based on morphological, cytological, and/or chloroplast DNA data, yet the parents of the hybrid remained unclear. Molecular phylogenetic relationships inferred here from chloroplast rbcL sequences and three nuclear DNA markers show that O. ×mildei is most likely a hybrid between the paternal O. japonica and the maternal O. vachellii.
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A New Allotetraploid Species of Osmunda (Osmundaceae)
Systematic Botany, 2011Co-Authors: Chie Tsutsumi, Yumiko Hirayama, Sadamu Matsumoto, Yoko Yatabe-kakugawa, Masahiro KatoAbstract:Abstract Osmunda subgenus Osmunda is variable across its worldwide range. In addition to the three species assigned to the subgenus, there is an enigmatic group of plants in Laos and Myanmar. To reveal the taxonomic and evolutionary status of these plants, we performed taxonomic, cytological, and flow-cytometric analyses, and molecular phylogenetic analyses for 32 samples of subgenus Osmunda for three nuclear DNA markers and the chloroplast rbcL gene. Results show that the enigmatic plants are a tetraploid (n = 44, 2n = 88) of hybrid origin from Osmunda regalis and O. japonica, which is described as Osmunda hybrida sp. nov. This is the first record of a naturally occurring polyploid species in the most primitive leptosporangiate family Osmundaceae, previously thought to be diploid throughout. Molecular data suggest that Indian O. regalis is a putative maternal ancestor and O. japonica is a paternal ancestor. Osmunda hybrida shares the fully dimorphic or partially dimorphic leaves with its parental species...
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Fertility and precocity of Osmunda × intermedia offspring in culture
Journal of Plant Research, 2011Co-Authors: Yoko Yatabe, Chie Tsutsumi, Noriaki Murakami, Kaoru Yamamoto, Wataru Shinohara, Masahiro KatoAbstract:The feasibility of later-generation hybrid production in ferns has not been previously studied, although it is a significant factor in relation to reproductive isolation. Osmunda × intermedia , a hybrid between O. japonica and O. lancea , is semifertile and has moderate spore germination rates. Under the artificial conditions of this study, F2 and F3 offspring were formed. Some of the F2 offspring showed precocity, and some of the F3 offspring also showed precocity. This fertility suggests that introgressive hybridization might be ongoing in nature. This also indicates a currently unknown genetic control over the timing of fertile frond production in Osmunda .
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fertility and precocity of Osmunda intermedia offspring in culture
Journal of Plant Research, 2011Co-Authors: Yoko Yatabe, Chie Tsutsumi, Noriaki Murakami, Kaoru Yamamoto, Wataru Shinohara, Masahiro KatoAbstract:The feasibility of later-generation hybrid production in ferns has not been previously studied, although it is a significant factor in relation to reproductive isolation. Osmunda × intermedia, a hybrid between O. japonica and O. lancea, is semifertile and has moderate spore germination rates. Under the artificial conditions of this study, F2 and F3 offspring were formed. Some of the F2 offspring showed precocity, and some of the F3 offspring also showed precocity. This fertility suggests that introgressive hybridization might be ongoing in nature. This also indicates a currently unknown genetic control over the timing of fertile frond production in Osmunda.
Alan R Hemsley - One of the best experts on this subject based on the ideXlab platform.
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Morphological, developmental and ultrastructural comparison of Osmunda regalis L. spores with spore mimics
Review of Palaeobotany and Palynology, 2009Co-Authors: Susannah E. M. Moore, Nina I Gabarayeva, Alan R HemsleyAbstract:A comparison of spores from Osmunda regalis L. and polystyrene-based spore mimics has been undertaken in order to provide insights into the development and formation of relatively primitive fern spores. In recent years, self-assembly experiments have provided different perspectives on the processes involved in pollen and spore wall pattern formation. The spore mimics obtained from the latest experiments closely resemble extant spore types and permit comparison with both immature and mature spores.
