Taylor, Witt , Pigg, Kathleen B. , Benedict, John C. , Farabee, Michael J. .
Juglandaceous Pollen In The Late Paleocene And Its Relationship To Cyclocarya.
Our current studies of the pollen and spore flora from the Late Paleocene Almont locality in central North Dakota demonstrate that juglandaceous pollen is a major component. Sporae dispersae genera that are typically considered to have juglandaceous affinities present in the flora include Momipites/Maceopolipollenites (at least 5 types), Caryopollenities (3 or 4 types) and Polyatriopollenites (2 types). At other localities Momipites has been found in the extinct Polyptera; Caryopollenites is thought to be the pollen of Carya, and Polyatriopollenites is usually associated with Pterocarya. In a related study, we are reinvestigating fossils of Cyclocarya brownii fruits and seeds for which we now have newly obtained material from the Beicegel Creek site with particularly detailed anatomical preservation. In association with these studies we have been investigating details of extant Cyclocarya paliurus, for which pollen is not well known. Our studies show that pollen of extant Cyclocarya exhibits an evenly dispersed microechinate sculpture that is common to this family and prominent arci connecting usually 4 pores. One or more of the pores may be in a different hemisphere, thus making the grains somewhat heteropolar. If this extant Cyclocarya pollen were found as sporae dispersae grains, it would most likely be mistaken as Alnipollenites. This sporae dispersae genus, generally thought to be of betulaceous affinities, has pores restricted to an equatorial zone, connected by arci, and sculpture that appears psilate to scabrate under light microscopy. However, under SEM, Alnipollenites clearly lacks the evenly distributed microechinate sculpture that typically characterizes juglandaceuos pollen. The use of SEM allows for more precise sculpture, pore type, and arrangement to correctly elucidate botanical relationships.
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1 - Arizona State University, School of Life Sciences, P.O. Box 874501, Tempe, Arizona, 85287-4501, USA
2 - Estrella Mountain Community College, Science and Mathmatics, 3000 N Dysart Rd, Avondale, AZ, 85340, USA
Presentation Type: Poster:Posters for Sections
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM