584 G. T. HARRIS, NOTE OX SLIDES OF FISSIDENTACEAE. 



the bifarious arrangement of the leaves, and especially to the 

 curious sheathing laminae, so characteristic of the Fissiclentaceae. 

 Many theories have been advanced to account for the conduplica- 

 tion, and if the one that regards it as being originally a stipule 

 that has become adnate to the nerve by one of its margins is 

 the correct theory it certainly opens up a very interesting vista 

 of evolution. 



Journ. Quekett Microscopical Club, Ser. 2, Vol. XII. , No. 77, November 1915. 



