408 



Transactions. 



Fig. 60. — The base of a young prothallial plantlet in longitudinal section, showing an 

 early stage in the development of a secondary apex. X 75. 



Fig. 61. — A young prothallial plantlet in longitudinal section, showing the secondary 

 apex in an unusual position. X 45. 



Figs. 62, 63. — Two young prothallial plantlets in longitudinal section, showing two 

 equally-developed shoot-regions. X 55. 



