Xviii EXPLANATION OF THE PLATES. 



4. H. undulatum. 



a. leaf, magnified. 



b. sporangium, magnified. 



5. Pylaisia polyantha. 



a. leaf, magnified. 



b. sporangium, magnified. 



c. portion of peristome, magnified. 



6. Homalothecium sericeum. 



a. leaves, magnified. 



b. sporangium, magnified. 



PLATE XIII. 



1. Thamnium alopeouram. 



a. leaf, magnified. 



b. veil, magnified. 



c. sporangium, magnified. 



2. Climacium dendroides. 



a. leaf, magnified. 



b. sporangium, magnified. 



c. portion of peristome, magnified. 



3. Leucodon sciuroides. 



a. leaves, magnified. 



b. leaf-cells, magnified. 



c. sporangium, magnified. 



d. portion of peristome with ring, magnified. 



4. Antitrichia curtipendula. 



a. leaf, magnified. 



b. sporangium, magnified. 



c. portion of peristome, magnified. 



d. portion of inner peristome, more highly magnified. 



5. Leptodon Smithii. 



a. leaves, magnified. 

 v b. veil, magnified. 



