EXPLANATION OF THE PLATES. XI 



4. S. acutifolium. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium with remains of veil, magnified. 



d. lid, magnified. 



5. S. squarrosum. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium with remains of veil, magnified. 



6. Andreaea alpiiia. 



a. plant, nat. size. 



b. leaves, magnified. 



c. portion of leaves, magnified. 



d. young sporangium, magnified. 



e. sporangium ruptured, magnified. 



7. A. rupestris. 



a. plant, nat. size. 



b, c. leaves, magnified. 



d. sporangium, magnified. 



PLATE III. 



1. Fontinalis squamosa. 



a. leaf, magnified. 



b. sporangium with perichaetium, magnified. 



c. portion of outer and inner peristome, magnified. 



2. F. antipyretica. 



a. leaf, magnified. 



b. leaf-cells, magnified. 



c. sporangium with perichaetium, magnified. 



d. veil, magnified. 



e. sporangium with peristome, magnified. 



3. Cryphaea heteromalla. 



a. leaf, magnified. 



