130 THE OLDER MESOZOIC FLORA OF VIRGINIA. 



PLATE VI. 



Figs. 1, 2. Macrotwuiopteris crassincrris, Feist. Pages 22 to 23. 



Fig. 1. A leaf of the smallest size. 



Fig. 2. A leaf of the maximum size. 

 Figs. 3, 3a. Acrostichides Unnmcefolius (Buub. species). Pages 25 to 29. 



Fig. 3. Represents a portion of a pinna from the lower part of a sterile frond. 



Fig. 3 a. Pinnule of the same magnified to show the nervation. 



PLATE VII. 



Figs. 1-4. Acrostichides linnaeefolius (Bunb. species). Pages 25 to 29. 



Fig. 1. Ultimate pinna? from the upper part of a large compound pinna, showing the pinnules 



all sterile. 

 Fig. 2. Ultimate pinna from the lower part of the same compound pinna from which Fig. 1 was 



taken, showing fertile and sterile pinnules on the same pinna. 

 Fig. 3. Tip of a fertile ultimate pinna. 



Fig. 4. Portion of a fertile ultimate pinna, showing the transition in form from sterile to fertile 

 pinnules. 

 Fig. 5. Acrostichides microphyllus, spec. nov. Pages 33 to 34. 

 Fig. 5. Shows a portion of the lower part of the frond. 



PLATE VIII. 



Figs. 1, la. Acrostichides linncecefolius (Bnnb. species). Pages 25 to 29. 



Fig. 1. A portion of a sterile compound pinna from the upper part of a frond. 



Fig. la. Pinnules of Fig. 1 magnified to show nervation. 

 Figs. 2, 3 6. Acrostichides rhonibifolius, spec. nov. Pages 29 to 32. 



Fig. 2. Terminal portion of a large ultimate pinna. 



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



Fig. 3. Portion of the upper part of a compound pinna when the ultimate pinn» are passing into 

 pinnules. 



Fig. 3 a. Magnified pinna from the lower part of Fig. 3. 



Fig. 36. Magnified pinna from the upper part of Fig. 3. 



PLATE IX. 



Figs. 1, la. Acrostichides Uiuiata-folius (Bunb. species). Pages 25 to 29. 

 Fig. 1. A fertile compound pinna. 

 Fig. la. Pinnules of the same magnified to show fructification and nervation. 



PLATE X. 



Figs. 1, la, lb, lc. Acrostichides densifolius, spec. nov. Pages 34 to 35. 

 Fig. 1. Portion of the normal frond or compound pinna. 

 Fig. 1 a. Magnified pinnules from the lower portion, and Fig. 1 b magnified pinnules from the upper 



portion of Fig. 1, to show nervation. 

 Fig. lc. Pinnules of Fig. 1 magnified to show the partial imbrication. 

 Fig. 2. Acrostichides microphyllus, spec. nov. Pages 33 to 34. Shows a very slender variety of this 

 species. 



