PLATE XVIII. 



Figs, i, a-h. Bryum drepanocarfum. 



I, a. Entire plant, natural size. 



I, b, b. Leaves ( X *3)« 



i, c. Transverse section of a leaf ( X6o). 



i, d. Part of the same ( X I 35)- 



i, e. Marginal areolation in the middle of a leaf ( X x 35)- 



i,y. Areolation of the apex ( X 1 35)- 



I, g. Young capsule ( X 13)- 



1, k. Capsule ripe, in dry state ( X x 3)- 



2, a-g. Bryum cylindrico-arcuatum. 

 2, a. Entire plant, natural size. 

 2, b, b. Leaves ( X 1 3)- 



2, c. Transverse section of a leaf ( X 60). 



2, d. Basal areolation ( X 135)- 



2, e. Cells in the middle of a leaf ( X I 35)« 



2,f. Areolation of the apex ( X J 35)« 



2, g. Capsule in dry state ( X I 3)« 



3, a-f. Bryum leftodictyon. 



3, a. Entire plant, natural size. 



3, b, b. Leaves ( X 13)- 



3, c. Basal areolation ( X J 35)- 



3, d. Cells in the middle of a leaf ( X ^S)- 



3, e. Areolation of the apex ( X x 35)' 

 3,y. Capsule in moist state ( X 13 )• 



I 4, a-g. Bryum pseudo-stirtoni. 



4, a. Entire plant, natural size. 

 4, £. Stem-leaf ( X 13). 



4, c, c, c. Branch-leaves ( X I 3)« 



4, d. Basal areolation ( X I 35)- 



4, e. Cells in the middle of a leaf ( X I 35)« 



4,y. Capsule ripe, in moist state ( X I 3)- 



4, g. Capsule in dry state ( X 1 Z)> 



(358) 



