STATE OF ILLINOIS 



DWIGHT H. GREEN, Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 



FRANK G. THOMPSON, Director 



DIVISION OF THE 



STATE GEOLOGICAL SURVEY 



M. M. LEIGHTON, Chief 

 URBANA 



CIRCULAR No. 73 



CONTRIBUTION TO PENNSYLVANIAN PALEOBOTANY 



NOTES ON THE LEPIDOCARPACEAE 



BY 



JAMES M. SCHOPF 



Reprinted from The American 

 Midland Naturalist, Vol. 25, 

 No. 3, pp. 548-563, May, 1941. 



PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS 



URBANA, ILLINOIS 

 1941 



