FIGS. 



PLATE XXXI. 



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

 a-e. Trickostomum siikanum. 



a. Entire plant, natural size. 



, b, b. Leaves ( X 13)- 



c. Basal areolation of a leaf ( X 1 35^- 



, d. Areolation in the middle ( X I 35) 



e. Areolation in the upper part ( X I 35) 



2, ai. Pottia keimii beringiana. 



2, a. Entire plant, natural size. 

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



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



2, d. Part of the same ( X 135)- 



2, e. Basal areolation of the leaf (X I 35) 



2,f. Areolation in the middle ( X I 35) 



2, g. Areolation of the apex ( X I 35) 



2, h. Capsule in moist state ( X I 3) 



2, i. Capsule ripe, in drj state ( X X 3) 



3, ai. Barbula brachypoda. 



3, a. Entire plant, natural size. 



3, b, b, b. Lower leaves (X 13)- 



3, c, c. Upper leaves ( X 13)- 



3, d, d. Perichaetial leaves ( X I 3) 



3, e. Basal areolation of the leaf ( X J 35)- 



3. f. Areolation in the middle ( X I 35)- 



3, g. Areolation of the upper part ( X 1 3S)- 



3, A. Capsule in moist state ( X I 3) 



3, i*. Portion of the annulus (X^o)* 

 [350] (310) 



