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Dive into the research topics where Patricia G. Gensel is active.

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Featured researches published by Patricia G. Gensel.


International Journal of Plant Sciences | 1993

The Gametophyte Generation of Some Early Devonian Land Plants

Winfried Remy; Patricia G. Gensel; Hagen Hass

We summarize the current information on gametophytic plants from the Lower Devonian that are represented by three types based on permineralizations in the Rhynie Chert, two of which are antheridial (Lyonophyton and Kidstonophyton) and one that is archegoniate (Langiophyton). Impression and compression remains attributed to Sciadophyton and Calyculiphyton also are interpreted as gametophytic, based on their similarity to the permineralized forms. All are axial structures, with some axes terminating in cup-shaped gametangiophores on or in which gametangia occur, and all exhibit preserved cuticles with stomata and conducting tissue. Similarity in epidermal and conducting cell characters serves as a basis for postulating sporophyte relationships for the Rhynie Chert gametophytes as follows (N-2N): Lyonophyton-Aglaophyton, Kidstonophyton-Nothia, and Langiophyton-Horneophyton. Comparison with bryophytes and tracheophytes shows that these forms exhibit unique combinations of characters. They are more advanced than bryophytes in some features but differ in conducting cell type from tracheophytes. Thus they may represent lineages distinct from either of these groups. Their construction indicates some degree of morphological similarity between haploid and diploid thalli in the life cycles of these entities, thus supporting to some extent an alternation of isomorphic generations and the homologous theory of sporophyte origin for land plants. Alternatively, these data may indicate the early establishment of axial gametophytic structures within the context of an antithetic theory of sporophyte origin.


Archive | 2001

12. Effects of the Middle to Late Devonian Spread of Vascular Land Plants on Weathering Regimes, Marine Biotas, and Global Climate

Stephen E. Scheckler; J. Barry Maynard; Patricia G. Gensel; Dianne Edwards


Archive | 2001

5. Morphology of Above- and Below-Ground Structures in Early Devonian (Pragian–Emsian) Plants

Patricia G. Gensel; Michele E. Kotyk; James F. Basinger; Dianne Edwards


Archive | 2001

11. Early Terrestrial Plant Environments: An Example from the Emsian of Gaspé, Canada

C. L. Hotton; Francis M. Hueber; D. H. Griffing; J. S. Bridge; Patricia G. Gensel; Dianne Edwards


Archive | 2001

7. The Middle Devonian Flora Revisited

Christopher Mark Berry; Muriel Fairon-Demaret; Patricia G. Gensel; Dianne Edwards


Archive | 2001

4. New Data on Nothia aphylla Lyon 1964 ex El-Saadawy et Lacey 1979, a Poorly Known Plant from the Lower Devonian Rhynie Chert

Hans Kerp; Hagen Hass; Volker Mosbrugger; Patricia G. Gensel; Dianne Edwards


Archive | 2001

6. The Posongchong Floral Assemblages of Southeastern Yunnan, China—Diversity and Disparity in Early Devonian Plant Assemblages

Hao Shougang; Patricia G. Gensel; Dianne Edwards


Archive | 2001

8. The Origin, Morphology, and Ecophysiology of Early Embryophytes: Neontological and Paleontological Perspectives

Linda E. Graham; Jane Gray; Patricia G. Gensel; Dianne Edwards


Archive | 2001

10. The Effect of the Rise of Land Plants on Atmospheric CO2 During the Paleozoic

Robert A. Berner; Patricia G. Gensel; Dianne Edwards


Archive | 2001

9. Biological Roles for Phenolic Compounds in the Evolution of Early Land Plants

Gillian A. Cooper-Driver; Patricia G. Gensel; Dianne Edwards

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Hagen Hass

University of Münster

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Hans Kerp

University of Tübingen

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Claudia I. Mora

Los Alamos National Laboratory

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Linda E. Graham

University of Wisconsin-Madison

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