132 THE OLDER MESOZOIC FLORA OF VIRGINIA. 



PLATE XVI. 



Figs. 1-3. Merteusides buUatus (Bunb. species). Pages 35 to 39. 



Fig. 1. Portion of a compound fertile pinna, showing the diminution in number of the sori towards 

 the summit of the pinna. 



Fig. 1 a. Pinnules of Fig. 1 magnified to show the fructification and nervation. 



Fig. 2. Portion of the upper part of a compound sterile pinna showing uncommon form of the pin- 

 nules. 



Fig. 2 a. Pinnules of Fig. 2 magnified to show nervation. 



FIG. 3. Portion of a compound sterile pinna showing au unusual form for the pinnules. 



PLATE XVII. 



Figs. 1-2 a. Merteusides buUatus (Bunb. species). Pages 35 to 39. 

 Fig. 1. Portion of the lower part of a compound sterile pinna. 

 Fig. 1 a. Pinnules of Fig. 1, magnified to show nervation. 

 Fig. 1 b. Heteromorphous pinnule of Fig. 1, magnified. 

 Fig. 2. Upper portion of a compound sterile pinna. 

 Fig. 2 a. Pinuules of Fig. 2, magnified to show nervation. 



PLATE XVIII. 



Figs. 1,2 a. Merteusides bullatus, (Bunb. species). Pages 35 to 39. 



FlG. 1. Portion of the lower part of a compound fertile pinna, showing the pinnules with undu- 

 late margins, and the increase of sori towards the middle and summit portions of the 

 ultimate pinnse. 



Fig. 2. Portion of a compound fertile pinna with fully fructified pinnules. A common form. 



FlG. 2 a. Pinuules of Fig. 2, magnified to show the fructification. 



PLATE XIX. 



FlG. 1. Merteusides buUatus (Bunb. 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. Asterocarpns Yirginiensis, spec. nov. Pages 41 to 45. 



Fig. 2. Portion of the lower part of a compound sterile pinna, showing deeply lobed pinnules. 



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



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



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



Fig. 5. Summit of a sterile pinna. 



PLATE XX. 



Figs. 1,2. Asterocarpns Yirginiensis, spec. nov. Pages 41 to 45. 



Fig. 1. Three compound sterile pinnse, that were once attached to a common rachis, showing the 



gradation in depth and shape of the lobes, from the lower to the upper and summit 



portions. 

 FlG. 1 a. Portion of the lower part of the lower compound pinna, magnified to show nervation. 

 FlG. 1 b. Portion of the summit of the uppermost compound pinna, magnified to show nervation. 

 Fig. 2. Summit of the middle compound pinna. 



