PLATE XIX. 



Fig. 1. Mertensides bullatus (Bunk, species). Pages 35 to 39. Portion of a fertile compound pinna, 

 showing the sori and nervation as seen when the upper surface of the plant is presented to 

 view. 

 Figs. 2-5. Asterocarpus Virginiensis, spec. riov. Pages 41 to 45. 



FlG. 2. Portion of the lower part of a compound sterile pinna, showing <b eply-loked pinnules. 



Fig. 2 fl. Portion of Fig. 2, magnified to show nervation. 



Fig. 3. Upper part of a sterile pinna, showing partially united pinnules. 



Fig. 4. Portion of a sterile pinna, with pinnules having a very broad midrib. 



FlG. 5. Summit of a sterile pinna. 



