182 Madeline Carson. 
total amount of assimilating tissue in the whole stem was not 
inconsiderable. 
The next specimen examined was Rhizophora ( Text-figs. 9 and 10). 
In general structure it resembled Bruguieni and gave the same 
results on staining. There were certain minor differences in the 
structure of the cortex. Here the cells were not so elongated in 
the radial direction as in Bruguiera, and the cortical air spaces were 
not so well marked. Otherwise the arrangement of tannin 
Text fig. 10. Rhizophora. Part of transverse section of the hypocotyl. 
containing and tannin free-cells in the cortex was similar, as also 
was the distribution of assimilating tissue. These species had also 
a well developed cuticle. 
In the specimen examined, only one section containing a 
stomate was obtained. It was not in an elevated position but was 
slightly sunk. Lenticels which were very numerous were always 
found on small tubercles. The stomate opened into a distinct 
chamber surrounded by assimilating tissue. 
