Serbet, Rudolph , Hageman, Scott , Hoffman, Brian , Krings, Michael , Taylor, Edith , Taylor, Thomas .
Lyginopterid seed fern diversity from the Pennsylvanian of Missouri.
An Upper Pennsylvanian locality (Bonner Springs Shale, Kansas City Group, Middle Missourian) in western Missouri is currently providing diverse and well preserved fossils of both plants and arthropods. The plant material that consists of both impressions and compressions and is composed of fertile and vegetative remains of various fern,seed fern, sphenophyte, lycopsid, cordaite and conifer taxa. The discovery of a branched putative lyginopterid pollen organ from this site demonstrates that this group of Paleozoic seed ferns was more diverse then previously known. The pollen organ is characterized by a primary axis with alternately arranged secondary and tertiary axes; with the latter producing flattened, shield-shaped units characterized by a thick equatorial margin and bearing pollen sacs on the abaxial surface. Each unit is approximately 5 mm in diameter and contains approximately 16 sporangia. Gland-like structures occur on the surface of the pollen organ. Pollen grains are radial and approximately 45 um in diameter; surface ornamentation includes the presence of both grana and coni. Fronds of the Spheopteris-type are commonly assigned to the lyginopterids and this morphotype is associated with the new pollen organs. The new pollen organ morphology is similar in basic organizational morphology to that of several lyginopterid pollen microsporangiate organ types, including Feraxotheca and Crossotheca, however, there are distinct differences suggesting that this organ represents a new morphogenus.
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1 - University Of Kansas, Division Of Paleobotany, NAT HIST MUS & BIODIV RES INST, 1200 Sunnyside Avenue, Lawrence, KS, 66045, USA
2 - Park University, Department of Natural and Physical Sciences, Parkville, MO, 64152, USA
3 - Bayerische Staatssammlung Für Paläontologie Und Ge, Richard-Wagner Strasse 10, Munich, Germany, D-80333, Germany
4 - University of Kansas, Ecology and Evolutionary Biology, 1200 Sunnyside Avenue, Haworth Hall, Lawrence, KS, 66045-7534, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell C/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 3:45 PM