XX EXPLANATION OF THE PLATES. 



b. young veil, magnified. 



c. sporangium, magnified. 



d. sporangium, when dry. 



e. portion of peristome, magnified. 



PLATE XV. 



1. Tetraplodon angustatus. 



a. plant, nat. size. 



b. leaf, magnified. 



c. veil, magnified. 



d. sporangium with lid, magnified. 



e. sporangium without lid, magnified. 



2. T. mnioides. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium with lid, magnified. 



d. sporangium without lid. 



e. portion of peristome, magnified. 



3. Splachnum sphaericum. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium with lid, magnified. 



d. sporangium without lid. 



4. S. ampullaceum. 



a. plant, male and female, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



5. S. vasculosum. 



a. plant, male and female, nat. size. 



b. leaf, magnified. 



c. sporangium with lid, magnified. 



d. sporangium without lid. 



