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The Frond of Heterangium

Gary L. Shadle and Benton M. Stidd
American Journal of Botany
Vol. 62, No. 1 (Jan., 1975), pp. 67-75
Stable URL: http://www.jstor.org/stable/2442079
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Frond of Heterangium
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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.

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