FIG. 33. 



Apogamy in Pteris creticei, L. A and B, development of the first foliar process close 

 to the emargination (k) on under surface of prothallus. C, a whole prothallus seen from 

 below, showing a young apogamous shoot. /> = prothallus ; 3 l = first leaf; z> = stem-apex ; 

 w = root. D, a similar growth more advanced. A and B X 145, C and D highly magnified. 

 (From Engler and Prantl, after De Bary.) 



