„ „^ "IX r 



Fig. 34. Gymnogramme sidphurea, a leptosporangiate fern 

 A, B, Sections of 16-celled embryo, cut at right-angles to the archegonial axis; the 

 sections traverse the inferior octants in A and the superior octants in B; the 

 anterior octants are uppermost ( x 380). C, D, E, Older embryos ; in C and D the in- 

 ferior and superior octants respectively have been cut parallel to the transverse wall; 

 in E, the section is a longitudinal median one; i.e. it is cut parallel to the axes of the 

 archegonium and the prothallus; C shows that the first leaf is derived from both 

 octants; the root initial can be seen in one of the posterior octants; in E the first 

 leaf, the shoot apex, the first root and the foot are distinguishable ( x 380). F, A 

 still older embryo in longitudinal median section. G, Scolopemlritim vidgare. 

 Longitudinal median section of embryo, showing the obliquity of the first partition 

 walls in the anterior octants, no 'epibasal disc' being formed; I-I, first or basal 

 wall; II-II, second or median wall; III-III, third or transverse wall; /, leaf; s, 

 shootapex, /-, root; /.foot. (A-E, G, x 380; F, x 190; after Vladesco.) 



