New Observations and Synthesis of Paleogene Heterosporous Water Ferns
作者： Margaret E. Collinson , Selena Y. Smith , Johanna H. A. van Konijnenburg-van Cittert , David J. Batten , Johan van der Burgh
DOI: 10.1086/668249
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摘要: Premise of research. Reproductive structures modern genera heterosporous water ferns (Marsileaceae and Salviniaceae) are widespread abundant in plant mesofossil assemblages from the Paleogene. For Salviniaceae, whole fertile fossil plants give a good understanding morphology. These fossils can be applied paleoenvironmental analysis to study fern origin, evolution, diversification.Methodology. New specimens were examined by SEM TEM. Synchrotron x-ray tomographic microscopy (SRXTM) is evaluated as nondestructive tool for investigating Azolla Lam. morphology.Pivotal results. Azolla anglica Martin Salvinia cobhamii (earliest Eocene, United Kingdom) fully characterized using SRXTM enables digital rendering float system Azolla, but individual floats difficult distinguish. Modern characterize Paleogene, extinct sister taxa Cretaceous. Literature review documents that intoler...
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