EARLY PENNSYLVANIA FLORA. FROM WEST-CENTRAL ILLINOIS 



IT 



Palaeopteridium reussii 



(Ettingshausen) Kidston 

 Text fig. TA-C; pi. k 9 figs. 1-5 



Synonymy 



1852 Asplenites Reussii , 



Ettingshausen, p. l6, 

 pi. 1, figs. 8 and 9 



I869 Palaeopteris Reussii , 

 Schimper, p. U78 



v. 1875 Archaeopteris stricta, 

 Andrews, p. Ul8, pi. 

 1+9, figs. 2, 2a 



v. 188 k Archaeopteris denti- 

 culata, Lesquereux, 

 P. 77*+ 



189 1+ Archaeopteris Reussii , 

 Kidston, p. 2^2 



191^ Archaeopteris Reussii , 

 Kidston, p. 95, pi. 

 5, figs. 7, 7a 



1923 Palaeopteridium Reus- 

 si 9 Kidston, p. 201- 

 203, pi. 55, figs. 1- 

 3 



v. 19^-9 Palaeopteridium Reus- 



si 9 Arnold, p. 219- 

 220, pi. 26, fig. 6 



Description . — Outline of pin- 

 nules -wedge-shaped, spatulate, or 

 diamond-shaped (text fig. 7A-C). 

 Some pinnules have stalk-like base, 

 some are attached with a larger 

 part of the base. Open dichotomous 

 venation. Veins forking once or 



Text fig. 7 - Fossil plants from the 

 Spencer Farm Flora. A-C, variation 

 of Palaeopteridium reussii pinnules 

 according to their position on the 

 frond or branch system. D, E, Gul- 

 penia limburgensis pinnules. Bar 

 scales are 5mm long. 



