XXVI EXPLANATION OF THE PLATES. 



d. peristome, magnified. 



e. a portion of inner peristome, magnified. 



7. Tetrodontium Brownianum. 



a. plant, nat. size. 



b. plant, magnified. 



c. leaf, magnified. 



d. perichsetial leaves, magnified. 



e. sporangium, magnified. 



f. peristome, magnified. 



8. Tetraphis pellucida. 



a. plant, nat. size. 



b. gemmiferous plant, nat. size. 



c. leaf, magnified. 



d. gemmiferous apex, magnified. 



e. young veil, magnified. 



/. sporangium with lid, magnified. 



g. sporangium without lid. 



h. peristome, magnified (the transverse lines are too strongly 

 marked). 



PLATE XX. 



1. Zygodon conoideus. 



a. plant, nat. size. 



b. leaf, magnified. 



c. veil, magnified. 



d. sporangium, magnified. 



2. Z. viridissimus. 



a. plant, nat. size. 



b. leaf, magnified. 



c. sporangium, magnified. 



d. sporangium, after lid has fallen. 



3. Z. lapponicus. 



a. plant, nat. size. 



