PLATE XVIII. 



1. Zieria julacea. 



a. plant, nat. size. 



b. leaf, magnified. 



c. leaf-cells, magnified. 



d. sporangium, magnified. 



2. Bryum roseum. 



"""a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



d. portion of outer peristome, magnified. 



e. portion of inner peristome, magnified. 



3. Leptobryum pyriforme. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



4. Orthodontium gracile. 



a. plant, nat. size. 



b. leaf, magnified. 



c. veil, magnified. 



d. sporangium, magnified. 



e. portion of outer peristome, magnified. 



5. Aulacomnion palustre. 



a. female plant, nat. size. 



b. leaf, magnified. 



c. leaf-cells, magnified. 



d. sporangium, magnified. 



e. gemmiferous plant, nat. size. 

 f. gemmae, magnified. 



ff. gemmae, more magnified. 

 G. Polytrichum septentrionale. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 

 7. P. juniperinum. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



d. peristome, magnified. 



e. portion highly magnified. 



