EXPLANATION OF THE PLATES. XXV 



PLATE XIX. 



1. Pogonatum nanum. 



a. plant, nat. size. 

 I. leaves, magnified. 



c. section of leaves, magnified. 



d. section of one of the lamellaB, magnified.^ 



e. young veil, magnified. 

 /. sporangium, magnified. 



2. P. aloides. 



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. 

 6. leaf, magnified. 



c. sporangium, magnified. 



d. .sporangium, without lid. 



5. Diphyseium foliosum. 



a. plants, nat. size. 



b. plants, magnified. 



c. sporangium, magnified. 



d. veil, magnified 



e. peristome, magnified. 



/. leaf, magnified, with two perichsetial leaves. 



6. Buxbaumia aphylla. 



a. plants, nat. size. 



b. sporangium, magnified. 



c. veil, magnified. 



