ANTHOPHYTA. 



255 



ing of the seed. In most cases, however, the cell-mass 

 continues its growth until it has formed a little stem, bear- 

 ing rudimentary leaves above and a root below. There are 

 to be found all degrees of simplicity in the embryos of An- 



ir I 



Fig. 153.— Embryo of Shepherd's-purse (Bursa), in various stages. D, 

 the suspensor. In Fthe root^cells, M), first appear, the rudimentary leaves, 

 c, c, and stem, s, already formed. Highly magnified. 



giosperms, from the rounded cell-mass (thallus) to the well- 

 formed plantlet provided with distinct root, stem, and 

 leaves. 



