70 THE PLANT CELL WALL 



Table 2. Characteristics of Endogenous Lignin in Test Species 



Under experimental conditions the angiosperms convert eugenol 

 into lignin only in the presence of peroxide (Table 3) whether or 

 not they also contain phenolase. Complete peroxide dependency 

 is also true for Psilotum, Selaginella, Rhodobryum and Junger- 

 mannia, relative dependency was observed in Equisetum, Polytrichum 

 and Marchantia. Only Bryum and Boletus formed lignin well with- 

 out peroxide, which, interestingly, actually inhibited the latter. 

 The ultraviolet absorption and other features such as color reactions 

 and chemical constitution again place the angiosperms in a common 



