436 



REPRODUCTION. 



Other sjnergide remains unchanged, or 

 passes Uirongli neai'ly the same changes 

 as those described. It should be said 

 that in some instances the pollen-tnbe 

 passes down without apparentl3- affect- 

 ing the sjnergidaa to anj' 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 ; 

 tlie fertilized or impregnated oosphere 

 is termed an oospore. It passes through 

 a series of changes bj- 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. 20i. Capsella Biirsa^paBtoris. Embryo developed more than in Fig. 203. A 

 longitudinal section showing cotyleQons, kb ; v, point of growth; e, suspensor ; p/, 

 plerom ; p and pe, periblem ; (?, anil d'-, dermatogen ; A^, and h^. root-cap. (Hanstein.) 



Fig. 205. Camelina pativa. a, two-celled embrjo, much exceeded in size by the 

 long suspensor. Capsella Bursa- pa storis, the figures &, r, showing different stages in the 

 development of the embryo; b,c,fJ, aspects of the embryo divided into quadrants; e,f,gi 

 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; A", same 

 as j, 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,^, r, later stages; g, same embryo seen from below, exhibiting the first divisions 

 near the suspensor; s, s', s", cells nearest the suspensor, (7..ucrssen, after Praz- 

 mowski.) ■ ■ - - . 



