XVI EXPLANATION OP THE PLATES. 



2. H. brevirostre. 



a. leaves, from before and behind, magnified. 



b. sporangium, magnified. 



3. H. triuuetrum. 



a. leaves, magnified. 



b. sporangium, magnified. 



4. H. loreum. 



a. leaves, magnified. 



b. sporangium, magnified. 



5. H. flagellare. 



a. leaves, magnified. 



b. sporangium, magnified. 



PLATE X. 



1. Hypnum squarrosum (a procumbent form). 



a. leaf from behind, magnified. 



b. sporangium, magnified. 



2. H. aduncum. 



a. leaves, magnified. 



b. sporangium, magnified. 



3. H. fluitans. 



a. leaves, magnified. 



b. sporangium, magnified. 



4. H. revolvens. 



a. leaves, magnified. 



b, sporangium, magnified. 



5. H. commutatum. 



a. leaf from behind, magnified. 



b. sporangium, magnified. 



6. H. filicinum. 



a. leaves, magnified. 



b. sporangium, magnified. 



