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. Andresea alpina. 



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 perichsetium, magnified. 



c. portion of outer and inner peristome, magnified. 



2. P. antipyretica. 



a. leaf, magnified. 



b. leaf-cells, magnified. 



c. sporangium with perichaetium, magnified. 



d. veil, magnified. 



e. sporangium with peristome, magnified. 



3. Cryphsea heteromalla. 



q.. leaf, magnified. 



