22 



Fig. 27. 



This figure is taken from a form with minute stipules ; usually 



the stipules in this species " are very large." 



In our Ch. hydropitys and in many allied forms, two single 



stipules are developed at the base of each leaf, and the group is said 



to be bi-stipulalcB. 



In the new and interesting 



species, Ch. socotrensis, Nord- 



stedt, a third stipule frequently 



develops between the two 



normal and constant single 



stipules; this third stipule does 



not turn upward like the two 



normal ones, but diverges in 



various ways. Fig. 28 is cop- 

 ied from Prof. Nordstedt's 



drawings, and represents the 



third stipule, variously directed. 



In all of these forms the stipules are single, though one, two or 



three times the number of the leaves. This large general series of 



single stipules is called Haplostephance 

 (corona stipularis e simplice serie cellu- 

 larum). 



The next series comprises Charae with 

 double stipules. The stipular cell divides 

 horizontally into an upper and lower cell, 

 or apparently, in some cases, the double 

 stipule arises from a single basal cell. 



Fig. 29, drawn, by camera, from a sec- 

 tion of Ch. crinita, shows a double basal cell "b,"and the double 



stipule "s" directed downward, " s' ' 



upward. 



Fig. 30 shows a lateral view of a 



fully developed double stipular crown 



in our Ch. sejuncta, the upper series di- 

 rected upward, equalling in length the 



lowest naked internodes of the leaves; -f^lSk JP^l^: ? 



the lower series directed downward, 

 pressed against the stem. All of this 

 series are termed Diplostephance. 



It is interesting to note that in the 

 foreign Lychnothamnus Wallrothii a Fig. 29. 



single stipule is developed exactly in front of (opposite) each leaf. 



Fig. 28. 



