EXPLANATION OF THE PLATES. XXV 



PLATE XIX. 



1. Pogonatum nanum. 



a. plant, nat. size. 



b. leaves, magnified. 



c. section of leaves, magnified. . 



d. section of one of the lamellae, magnified. 



e. young veil, magnified. 

 /. sporangium, magnified. 



2. P. abides. 



a. plant, nat. size. 



b. leaves, magnified. 



c. young veil, magnified. 



d. sporangium, magnified. 



3. P. hercynicum. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



4. Atrichum undulatum. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



d. sporangium, without lid. 



5. Diphyscium foliosum. 



a. plants, nat. size. 



b. plants, magnified. 



c. sporangium, magnified. 



d. veil, magnified 



e. peristome, magnified. 



/. leaf, magnified, with two perichaetial leaves. 



6. Buxbaumia aphylla. 



a. plants, nat. size. 



b. sporangium, magnified. 



c. veil, magnified. 



