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 (Angiopleris evecla). (Cf. Fig. 416.) 



Its foliage 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. A. American Fern Journal, 5 : 85. 1915. 



