DEVELOPMENT. 



teeth of the peristome are attached. This is peculiar to the 

 family of Polytrichaceae, so far as British mosses are con- 

 cerned. 



The study of the development of mosses is one of very 

 great interest, and worthy of the attention of all biological 

 students. Space is too limited to allow the matter to be 

 dealt with here in anything like fulness, and I must there- 



FIG. 16. Atrichum undulatum. i, plant natural size. 2, leaf enlarged; 2 a, 

 apex of same more highly magnified. 2 b, middle of same, to show areolation 

 and lamellate nerve. 3, a portion of the fruit enlarged ; a, diaphragm or drum ; 

 b, peristome; c, capsule. 



fore refer those students who desire fuller information to 

 that grand work of Hofmeister's (Ray Society's publications) 

 on the " Germination, Development, and Fructification of the 

 Higher Cryptogamia," pp. 129-18.1, where a most elaborate 

 and exhaustive account will be found. 



