GROUP IV. PHANEROGAMIA. 



443 



In those plants which have a snspensor which contributes to 

 the embryo, the embryo- cell is not a complete sphere. It divides, 



Fro. 2S8. Embryogeny of Dicotyledons as represented by Capsella Bursa-Pastoris (dia- 

 grammatic, after Goebel and Hanstein). A-J) Successive stages: susp. suspensor; emb. 

 embryo ; 1-1, 2-2, octant-walls ; a lowest cell of suspenscr, dividing in B to form the hypo- 

 physial cell h; in Cthe hypophysial cell has divided into two, Ti^ and h a , the former con- 

 stituting the periblem, the latter the dermatogen, of the growing-point of the primary 

 root ; in D, h a has undergone a periclinal division to form the primitive root-cap : dderma- 

 tosien ; c periblem ; pi. plerome ; cot. cotyledons, between which lies the growing-point of 

 the primary stem. 



as a rule, into two by a longitudinal wall, then transversely, and 

 then in a plane to both the preceding, into octants; but while 



