PLATE XL. 

 [Proc. Wash. Acad. Sci., Vol. IV, PI. XXIII.] 



FIGS, i, a-d. Hypnum pseudostramineum. 



i, a, a. Leaves ( X *8). 



i, b. Lower part of the costa ( X I 3)- 



i, c. Areolation in the middle of a leaf ( X 22 5) 



1, d. Areolation of the apex of a leaf ( X 22 5)* 



2, a-h. Hypnum plesiostramineum. 

 2, a. Entire plant, natural size. 

 2, b, b. Lower leaves ( X J 8)- 



2, c. Lower part of the costa ( X 130)- 



2, d. Upper leaf (Xi8). 



2, e. Branch leaf (Xi8). 



2,y. Auricle and basal areolation of a leaf ( X 22 5) 



2,^-. Cells in the middle ( X 225). 



2, h. Areolation of the apex ( X 22 5) 



3, a-e. Meesea tschuctschica. 



3, a. Entire plant, natural size. 



3, b. Part of astern (X3)- 



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



3, d. Marginal areolation in the middle ( X I 35) 



3, e. Areolation of the apex ( X 135)- 



4, a-c. Brachythecium reftexum pacificum. 

 4, a. Stem-leaf ( X 13). 



4, b. Basal areolation ( X 135)- 



4, c. Marginal areolation in the middle ( X I 35) < 

 [368] (3 2 8) 



