43C 



REPRODUCTK )X. 



other synergide remains unchanged, or 

 passes through nearty the same changes 

 as those described. It should be said 

 that in some instances the pollen-tube 

 passes down without apparently affect- 

 ing the sj'nergidffi to any very marked 

 extent, but producing its influence di- 

 rectly upon the oosphere. 



1129. These changes now described 

 in the oosphere are known collectively 

 as those of fertilization or impregnation ; 

 the fertilized or impregnated oosphere 

 is termed an oospore. It passes through 

 a series of changes by which a second 

 cell is formed, then others in a linear 

 series, or in a more complex chain, 

 termed the proembryo or suspensor. 

 In some cases, however, no suspensor 

 at all is produced. 



FIG. 204. Capsella Bursa-pastoris. Embryo developed more than in Fig. 203. A 

 longitudinal section showing cotyledons, kb ; r, point of growth; e, suspensor ; pJ, 

 plerom ; p and pe, periblem ; (7, and <7 2 , dermatogen; h l , and h-, root-cap. (Hanstein.) 



FIG. 205. Camelina sativa. a, two-celled embryo, much exceeded in size by the 

 long suspensor. Capsella Bursa-pastoris, the figures b, r, showing different stages in the 

 development of the embryo; l>,c,d, aspects of the embryo divided into quadrants; e,f,g, 

 different views of the embryo at the formation of the dermatogen ; i, longitudinal sec- 

 tion showing further divisions and the formation of the periblem and plerom; k, same 

 as i, but given in perspective; /, longitudinal, m, transverse, section of the same em- 

 bryo at a later stage ; n, perspective view of embryo at a little earlier stage than / and 

 m ; o, p, r, later stages; </, same embryo seen from below, exhibiting the first divisions 

 near the suspensor; s, a', s", cells nearest the suspensor. (Luerssen, after Praz- 

 mowski.) 



