410 



Transactions. 



65 



66 



67 



Figs. 65a-65c. — The young lateral adventitious apex shown in fig. 65d in three trans- 

 verse sections from the apex downwards (Nos. 1, 2, and 5). X 75. 



Fig. 65d. — -Outline of a young prothallial plantlet in longitudinal section, showing the 

 first and second apices of growth, foot, distribution of fungus, and the 

 position of a lateral adventitious apex. X 20. 



Figs. 66a, 66b. — The apical region of a young prothallial plantlet in longitudinal section, 

 showing a very young lateral apex cut obliquely. The sections A and E 

 are not consecutive. X 75. 



Figs. 67a-67c. — A very young lateral adventitious apex in three transverse sections 

 from the apex downwards (Nos. 1, 7, and 12). X 75. 



