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THE FROND OF HETERANGIUM
Gary L Shadle1, Benton M Stidd1
1Department of Biological Sciences, Western Illinois University, Macomb.
American Journal of Botany
|August 25, 2018
Abstract:
Frond members belonging to the monostelic seed fern genus Heterangium have been found in Pennsylvanian age coal balls collected in the Illinois Basin. Petioles bear small pinnae below a dichotomy which produced a bipartite frond. Pinnules of the Sphenopteris obtusiloba type are borne on secondary pinnae. The anatomy of each pinna order and the pinnules is described.
