EXPLANATION OF THE PLATES. Xlll 



5. Homalia trichomanoides. 



a. leaf, magnified. 



b. sporangium, magnified. 



c. portion of peristome, magnified. 



6. Hypnum nitens. 



a. rootlets, magnified. 



b. tip of one more highly magnified. 



c. leaves, magnified. 



d. sporangium, magnified. 



PLATE V. 



1. Hypnum albicans. 



a. leaf, magnified. 



b. sporangium, magnified. 



c. lid, magnified. 



2. H. lutescens. 



a. leaf, magnified. 



b. sporangium, magnified. 



3. H. plumosum. 



a. leaf, magnified. 



b. sporangium, magnified. 



4. H. velutinum. 



a. leaf, magnified. 



b. sporangium, with peristome, magnified. 



c. sporangium, with lid, magnified. 



5. H. rutabulum. 



a. leaf, magnified. 



b. sporangium, magnified. 



c. part of peristome, magnified. 



d. ring, magnified. 



6. H. rivulare. 



a. leaf, magnified. 



b. sporangium, magnified. 



