BEITISH MOSSES. 



35 



When we turn to consider affirmatively what Moss 

 leaves are, we find them in some cases characterized by 

 an extreme simplicity of form. They are single plates of 

 similar cells without midribs, without veins, and without 

 border. 



The accompanying Fig. 18, representing a leaf of the 



FIG. 18. Leaf of Hookeria lucens, magnified, after 

 nature. A. F. 



beautiful Moss, the Hookeria lucens, is an illustration of 

 this form of leaf, and the Figs. 19 and 20 will show more 



FIG. 19. Cells of young leaf 

 of Hoolceria lucens, after 

 nature. A. F. 



Fl&. 20. Cells of old leaf 

 of SooJceria lucent, after 

 nature. A. F. 



