In the coal balls of the Des Moines Series (Pennsylvanian System) many arborescent Lycopod leaves arc preserved. A number of these have been investigated anatomically in serial nitrocellulose peels and in thin rock sections. The anatomy and abundance are discussed in the paper.
Proceedings of the Iowa Academy of Science
©1941 Iowa Academy of Science, Inc.
Wilson, L. R. and Tillepaugh, Iola
"Observations of the Leaves of Arborescent Lycopods From the Pennsylvanian Rocks of Iowa (Abstract),"
Proceedings of the Iowa Academy of Science, 48(1), 197-197.
Available at: https://scholarworks.uni.edu/pias/vol48/iss1/34