Sphenopteris sellardsii, a problematical pteridosperm from the Permian of Kansas

Sphenopteris sellardsii, a problematical pteridosperm from the Permian of Kansas

by Robert W. 1914- Baxter

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Discusses the characteristics of Sphenopteris sellardsii, a new species of pteridosperm based on fertile foliage from the Elmo Limestone member of Early Permian age in east-central Kansas.

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