64 



divisions on the side nearest the embryo — this 

 suspensor is wanting in all other Cryptogams, 

 but universally present in Phanerogams, and 

 through which Selaginella consequently ap- 

 proaches the flowering plants. 

 (4) This elongation causes the embryo to be 

 forced into the tissue of the endosperm, where 

 it undergoes further development. Two cells 

 are formed by a transverse wall, these divide 

 by a wall at right angles to the first. Two of 

 these cells go to form the foot, which conveys 

 nourishment from the prothallus to the growing 

 stem and leaf. The root is formed some time 

 after, from one of its inner segments. The 

 foot is a characteristic of Cryptogams. One of 

 the remaining cpUs of the original four goes to 

 form the stem, and the other the leaf. 



6r^ G^^ (S<^^0C3 G^^ Ke) 



