THE EVOLUTION OF PLANTS 



595 



to the stem of [the fern] Osmunda, but when more mature 

 certain cycadean characters appear to predominate."^ 



Fig. 417. — ^Leaf of a fern (Angiopkris cvecta). (Cf. Fig. 416.) 



Its foHage and other characters closely resemble some 

 of our modern tree-ferns (Cf. Figs. 416 and 417) but more 

 careful study of the calcified specimens of much beauty 



^ Knowlton, F. H. American Fern Journal, 5 :85. 1915. 



