CH. XVl] 



APOGAMY 



319 



Fig. 295. Apogamy in Ptei-is cretica, L. A and j5 = development of the first foliar process close to 

 the emargination (/'), on the under surface of the prothallus. C=a whole prothallus seen from 

 below, showing a young apogamous shoot. / = prothallus; <^i = first leaf; w = stemapex; w = root. 

 D = ?i similar growth more advanced. A and By. 145. C and D less highly magnified. (After 

 De Bary, from Engler and Prantl.) 



