XXXII 



STRUCTURE 



439 



The latter organs are, quite exceptionally among the higher 

 plants, wholly absent. 



The stem ends distally in a terminal bud (/. bd\ the 



S.l.f 



FIG. 114. Distal portion of a Salvinia plant seen obliquely from 

 below. 



The stern (st) ends in a terminal bud (/. bd), and the part figured 

 contains three nodes, each bearing a pair of foliage-leaves (f. I. 1-3, 

 /. /. i'-3'), and a much-divided root-like submerged leaf (s. I. 1-3). 

 On the bases of the submerged leaves are borne groups of sori (so), 

 containing sporangia. (Slightly enlarged.) 



(From Vines, after Sachs.) 



growing point of which is formed by a two-sided apical cell : 

 it is traversed by a single vascular bundle, which sends 

 branches into the leaves. 



