A5009406666- Plant Diversity and Evolution
- Plant and Fungal Species Descriptions
- Plant and animal studies
- Fern and Epiphyte Biology
- Plant Parasitism and Resistance
- Botany, Ecology, and Taxonomy Studies
- Evolution and Paleontology Studies
- Geology and Paleoclimatology Research
- Species Distribution and Climate Change
- Genomics and Phylogenetic Studies
- Botany and Geology in Latin America and Caribbean
- Mycorrhizal Fungi and Plant Interactions
- Plant Taxonomy and Phylogenetics
- Geochemistry and Geologic Mapping
- Genetic diversity and population structure
- Ecology and Vegetation Dynamics Studies
- Paleontology and Stratigraphy of Fossils
- Canadian Identity and History
- Diatoms and Algae Research
- Environmental and Cultural Studies in Latin America and Beyond
- Geography Education and Pedagogy
- Marine and coastal plant biology
- Bat Biology and Ecology Studies
- Heavy Metal Pollution Remediation
- Archaeology and ancient environmental studies
Cornell University
2000-2024
Ithaca College
2019-2024
Institute of Paleontology A A Borisyak
2023
Ohio University
2013-2020
American Museum of Natural History
2006-2008
University of Kansas
2006-2008
Natural History Museum
2007
German Oceanographic Museum
2007
New York Botanical Garden
2006
University of Wisconsin–Madison
1999-2000
The Early Devonian Rhynie chert has been critical in documenting early land plant-fungal interactions. However, complex associations involving several fungi that enter into qualitatively different relationships with a single host plant and even interact one another have not yet detailed. Here, we studied petrographic thin sections of the Nothia aphylla. Three fungal endophytes (co)occur prostrate axes this plant: narrow hyphae producing clusters small spores; large spherical...
The evolutionary history of Eucalyptus and the eucalypts, larger clade seven genera including that today have a natural distribution almost exclusively in Australasia, is poorly documented from fossil record. Little physical evidence exists bearing on ancient geographical distributions or morphologies plants within clade. Herein, we introduce material early Eocene (ca. 51.9 Ma) Laguna del Hunco paleoflora Chubut Province, Argentina; specimens include multiple leaves, infructescences,...
Many modern paleobiological analyses are conducted at the generic level, a practice predicated on validity of genera as meaningful proxies for species. Uncritical application in such analyses, however, has led—perhaps inadvertently—to unjustified reification an evolutionary context. While utility species studies should be evaluated empirical issue, it is increasingly assumed (rather than demonstrated) that suitable This problematic both ontological and epistemological grounds. Genera...
Fossils provide the principal basis for temporal calibrations, which are critical to accuracy of divergence dating analyses. Translating fossil data into minimum and maximum bounds calibrations is most important—often least appreciated—step dating. Properly justified require synthesis phylogenetic, paleontological, geological evidence can be difficult nonspecialists formulate. The dynamic nature record (e.g., new discoveries, taxonomic revisions, updates global or local stratigraphy)...
Cataphylls associated with the Middle Triassic stem genus Antarcticycas are described, and their impact on understanding cycad evolution is discussed. The cataphylls of triangular in outline flattened adaxially lateral flanges. outer surfaces covered a ramentum filamentous hairs, epidermis single cell layer thick, ground tissue parenchymatous mucilage canals sclereids. Vascular bundles form distinct inverted omega-shaped pattern characteristic Cycadales observed petioles extant species....
Taylor, E. L., T. N. Taylor (Department of Ecology and Evolutionary Biology, Natural History Museum Biodiversity Research Center, 1200 Sunnyside Ave., University Kansas, Lawrence, KS 66045), H. Kerp (Forschungsstelle für Paläobotanik, Westfälische Wilhelms-Universität Münster, Hindenburgplatz 57, D-48143 Germany), E.J. Hermsen 66045). J. Torrey Bot. Soc. 133: 62–82. 2006.—Mesozoic seed ferns represent a grade gymnospermous plants whose affinities remain problematic. The three major orders...
• Premise of the study: Herein, we name, describe, and illustrate new macrofossil material representing Eucalyptus (Myrtaceae: Myrtoideae, Eucalypteae) from diverse early Eocene Laguna del Hunco (LH) flora Chubut Province, Patagonia, Argentina. We explore significance these fossils in light understanding fossil record eucalypts biogeography Eucalypteae. Methods: Fossils vegetative reproductive organs were collected multiple LH localities over several field seasons. These specimens prepared,...
In this contribution, we describe latest Cretaceous aquatic plant communities from the La Colonia Formation, Patagonia, Argentina, based on their taxonomic components and paleoecological attributes. The Formation is a geological unit deposited during Maastrichtian-Danian transgressive episode of South Atlantic Ocean. This event resulted in deposition series fine-grained sediments associated with lagoon systems occurring along irregular coastal plains northern Patagonia. These deposits...
The early Eocene Laguna del Hunco caldera-lake paleoflora (ca. 52 Ma) from Chubut Province, Argentina, is notably diverse and includes many conifer angiosperm lineages that are extinct in South America but extant Australasian rainforests. No ferns have been previously described Hunco. We describe interpret a new species of fossil Osmundaceae based on fertile sterile pinnae. •The specimens were compared with other living herbarium material published descriptions. A morphological matrix 29...
A major challenge in the post-genomics era will be to integrate molecular sequence data from extant organisms with morphological fossil and taxa into a single, coherent picture of phylogenetic relationships; only then these hypotheses effectively applied study character evolution. At least two analytical approaches solving this problem have been utilized: (1) simultaneous analysis included as terminals analysis, (2) scaffold approach, which are analyzed over backbone (with constraints that...
Premise of research. Fossils representing aquatic ferns with clear affinities to extant Regnellidium (Salviniales, Marsileaceae) are reported for the first time from Upper Cretaceous sediments La Colonia Formation, Chubut Province, Argentina.Methodology. Preserved organs including rhizomes bearing roots, compound leaves, and associated putative sporocarps were collected Cerro Bosta Quebrada del Helecho localities Formation. Spores macerated macrofossil-bearing locality examined SEM.Pivotal...
Fossilized flowers and fruits from the Upper Cretaceous (Turonian, ca. 90 million years [my] before present) Raritan Formation of New Jersey are described as new genus Divisestylus with two species, D. brevistamineus longistamineus . The fossils fusainized three‐dimensionally preserved. Morphological characteristics suggest affinities extant Saxifragaceae Iteaceae, closely related families in Saxifragales. Similarities include a pentamerous perianth, calyx fused below into hypanthium free...
Abstract Specimens of a new fruit genus and species, Alatonucula ignis, from the early Eocene Laguna del Hunco flora Chubut, Patagonia, Argentina, have characteristics consistent with assignment to Juglandaceae. Each fossil consists nutlet an attached wing that varies unlobed trilobed. One specimen clearly shows has single locule partially subdivided into four chambers; its counterpart contains four-lobed cast. The basally partitioned lobed seed indicates can be placed within Juglandaceae;...
Rhizomatous axes of Nothia aphylla, a land plant from the 400-myr-old Rhynie chert, host fungus that closely resembles Glomites rhyniensis (Glomeromycota), endomycorrhizal chert Aglaophyton major. However, G. is an intercellular endophyte becomes intracellular exclusively within well-defined region cortex, while in N. aphylla initially but later cortex. We hypothesize displays alternative mode colonization by fungi, perhaps related to peculiar internal anatomy lower portion rhizomatous axis,...
Divergence dating studies, which combine temporal data from the fossil record with branch length molecular phylogenetic trees, represent a rapidly expanding approach to understanding history of life. National Evolutionary Synthesis Center hosted first Fossil Calibrations Working Group (3–6 March, 2011, Durham, NC, USA), bringing together palaeontologists, evolutionists and bioinformatics experts present perspectives disciplines that generate, model use calibration data. Presentations...
Permineralized cycad petioles and/or rachides with associated pinnae are described from two Triassic localities in the Queen Alexandria Range, central Transantarctic Mountains, Antarctica. Petiole‐rachides display an inverted‐omega‐shaped arrangement of vascular bundles typical most genera extant Cycadales and exarch primary xylem that link them to modern order. Pinnae Antarctic petiole‐rachides thin, regularly spaced bundles. They similar those Zamia other Cycadales, whose lack midribs....
ResumenEn esta contribución, se presentan elementos paleoflorísticos de la Formación La Colonia (Campaniano-Maastrichtiano, Cretácico tardío), cual encuentra expuesta entre Telsen y Sierra Rosada en el área conocida como Meseta Norpatagónica,
Premise of research. While Azolla has a rich fossil record based on dispersed megaspore apparatuses and microspore massulae, sporophytes are relatively rare. In this contribution, we describe two species both spores from Chubut Province, Patagonia, Argentina: coloniensis De Benedetti & Zamaloa, emend. Hermsen et al., A. keuja Jud sp. nov. the first to be represented by vegetative structures (i.e., leaves, stems, roots) South America Southern Hemisphere.Methodology. We examined sporophyte...
Spaciinodum collinsonii, a Triassic sphenophyte from the central Transantarctic Mountains, Antarctica, is reinterpreted based on new material in order to clarify discrepancies previous work and detail development ecology of plant. Vegetative stems have alternating nodes internodes, distinguished by solid diaphragm tissue, internodes presence vallecular (cortical) carinal canals, hollow pith. Whorls branches arise immediately above nodes, with leaves subjacent nodes. Branches develop cortex...