XXXIVl 



HABIT 



313 



The basal cells are not indurated, and they show signs of intercalary activity ; 

 but in the upper parts they are thick-walled, and each bristle runs out into 

 a stiff terminal spine. There is no branching. This state is an advance upon 



Fig. 569. Juvenile leaves of Dipteris Lobbiana. a, b, from specimens belonging to Dr Lang. 

 r, d, after drawings by Miss De Bruyn. 



F^i.?- 57°- Juvenile leaves of Dipteris coiijugata, showing from the first 

 reticulation superposed upon dichotomous branching. ( x 6.) 



