302 



Transactions. — Botany. 



As a lineal classification of the Thallophytes is impossible, I 

 would tabulate them thus, the orders of the Alga being given in 

 full:— . 



00 



« 



a 

 a 

 O 



CD 



GO 

 O 



(>> 



O 



P. 

 03 



o 



O 



o 



co 

 u 



o 

 p, 



m 

 O 

 O 



N 



a 

 o 



P 



05 

 X 



o 



n 

 p 





ft 



o 



Ch 



co 



.9 



o 



j> 



'o 



CD 



o 



S3 

 oo 



c3 

 6C 

 P 



'5* 



o 

 O 



o 



ft 



a) 

 O 



ft 



>H 



CO 



o 



bo 



60 



a 



s 



d 



The genealogical tree on Plate Xa. seems to me to show, as 

 nearly as our present knowledge will permit, tbe genetic affinities 

 of tbe different orders of the Alga,. Of course, much of it is 

 provisional and somewhat doubtful. For example, I have placed 

 the Palmdlacea as the lowest group, but this position may belong 





