PLATE XL. 

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



FIGS, i, a-d. Hypnum pseudostramineum. 

 I, a, a. Leaves ( X J 8). 

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

 i, c. Areolation in the middle of a leaf ( X 225). 



1, d. Areolation of the apex of a leaf ( X 2 25). 



2, a-h. Hypnum plesiostramineum. 

 2, a. Entire plant, natural size. 

 2, b, b. Lower leaves ( X 18). 



2, c. Lower part of the costa ( X 13)- 



2, d. Upper leaf (Xi8) 



2, e. Branch leaf (Xi8). 



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



i,g. Cells in the middle ( X 225). 



2, h. Areolation of the apex ( X 225). 



3, a-e. Meesea tschuctschica. 



3, a. Entire plant, natural size. 



3, b. Part of a stem ( X3)- 



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



3, d. Marginal areolation in the middle ( X 1 35)- 



3, e. Areolation of the apex ( X J 35)- 



4, a-c. Brachythecium reflexum pacificum. 

 4, a. Stem-leaf ( X I 3)- 



4, b. Basal areolation ( X 135)- 

 4, c. Marginal areolation in the middle ( X I3S) 

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