282 INTRODUCTION TO EMBRYOLOGY OF ANGIOSPERMS 



to the daughter cells n and n', of which the former functions as a 

 hypophysis and gives rise to the root cap and periblem initials of 

 the root, and the latter gives rise to a short suspensor (Fig. 155D,E). 



Fig. 155. Development of embryo in Myosotis hispida. (After Soueges, 1923a.) 



Caryophyllad Type. The embryo of Sagina procumbens (Soueges, 

 1924a), which is the most typical of all the forms described under 

 the Caryophyllad type, is characterized by the fact that here the 

 basal cell cb remains undivided and forms a large vesicular struc- 



Fig. 156. Development of embryo in Sagina procumbens. (After Soueges, 1924a.) 



ture which does not take any further part in the development of the 

 embryo. The terminal cell ca undergoes transverse divisions to 

 form a row of four cells designated as ci, m, V, and I (Fig. 156 A-D). 

 Of these, each of the three lower cells divides by a vertical wall and 

 the upper cell ci divides by a transverse wall (Fig. 15QE,F). The 



