EXPLANATION OF PLATES. 133 



PLATE XXI. 



FlGS. 1, 2. Asterocarpus Virginiensis, spec. uov. Pages 41 to 45. 



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

 diminishing depth of the lobes from base to summit. 



Fig. la. Portion of a lower pinnule of Fig. 1, magnified to show the nervation. 



Fig. lb. Pinnule from the upper part of Fig. 1, magnified to show nervation. 



Fig. 2. Portion of a sterile pinna with large, broad pinnules. 

 Figs. 3,4. Asteroiarpus Virginiensis, var. obtusilobus. Page 45 to 46. 



Fig. 3. Summit of a sterile ultimate pinna magnified. 



Fig. 4. Upper part of a compound sterile pinna. 



PLATE XXII. 



Figs. 1-3. Asterocarpus Virginiensis, spec. nov. Pages 41 to 45. 



Fig. 1. Portion of a sterile compound pinna with large pinnules. A common form. 



Fig. la. Pinnule of Fig. 1, magnified to show nervation. 



Fig. 2. Portion of a compound pinna showing fructification only at the tips of the pinnules. 



Fig. 3. Portion of the stipe. 



PLATE XXIII. 



Figs. 1-4 a. Asterocarpus Virginiensis, spec. nov. Pages 41, to 45. 



Fig. 1. Several fertile pinnaj that were ouce attached to a common rachis, seen from the upper 



surface with the sori showing through the leaf substance of the pinnules. 

 Fig. 2. Portion of the lower part of a compound fertile pinna, seen as in Fig. 1. 

 Fig. 3. Portion of a compound sterile pinna showing unusually large pinnules with undulate 



margins. 

 Fig. 4. Portion of a fertile pinna seen from the under side and showing the true form of the sori. 

 FIG. 4a. Portion of the pinnule of Fig. 4, magnified to show the form of the sori. 



PLATE XXIV. 



Figs. 1,2a. Asterocarpus rirginiensis ? spec. nov. Page 42. 



Fig. 1. Portion of a compound fertile pinna of perhaps a variety of A. Virginiensis. 



Fig. 2. Fragment of a larger form of the same plant. 



Fig. 2a. Pinnules of Fig. 2, magnified to show the sori. 

 Figs. 3-5a. Asterocarpus Virginiensis, var. obtusilobus. Pages 45 to 46. 



Fig. 3. Portion of a sterile compound pinna of the normal form. 



Fig. 3 a. Pinnules of Fig. 3, magnified to show the nervation. 



Fig. 4. Portion of a long sterile ultimate pinna. 



Fig. 4 a. Pinnule of Fig. 4 magnified. 



Fig. 5. Ultimate sterile pinna with broad deep lobes. 



Fig. 5a. Pinnule of Fig. 5 magnified. 



PLATE XXV. 



Figs. 1, la. Asterocarpus Virginiensis, var. obtusilobus. Pages 45 to 46. 



Fig. 1. Shows a form with broad rounded lobes and a fine, closely crowded nervation. 



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

 Figs. 2-6. Asterocarpus platyrachis, spec. nov. Pages 46 to 47. • 



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



Fig. 3. Portion of a fertile compound pinna with fully fructified pinnules. 



Fig. 3 a. Pinnules of Fig. 3, magnified to show the sori. 



