PLATE XVII. 



1. Cinclidium stygium. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



d. portion of peristome, magnified. 



2. Mnium affine. 



a. female plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



d. male plant, nat. size. 



3. M. cuspidatum. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



4. M. undulatum. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



5. M. rostratum. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



6. M. punctatum. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



d. portion of peristome, magnified. 



7. Amblyodon dealbatus. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



d. portion of peristome, magnified. 



e. portion of inner peristome, more highly magnified. 



