FIGS. 



PLATE XXXI. 



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

 a-e. Trickostomum sitkanum. 



a. Entire plant, natural size. 



, b, b. Leaves ( X 13)- 



c. Basal areolation of a leaf ( X J 35) 



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



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



2, a z. Pottia heimii 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 J 35)- 



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 35J- 



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



2, /. Capsule ripe, in dry state ( X J 3) 



3, a-i. Barbula brachypoda. 



3, a. Entire plant, natural size. 

 3, b, b, b. Lower leaves (X I 3) 



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



3, d, d. Perichaetial leaves ( X 13)- 



3, e. Basal areolation of the leaf ( X I35) 



3. f. Areolation in the middle ( X J 35) 



3, g. Areolation of the upper part ( X I35) 



3, Ji. Capsule in moist state ( X J 3)- 



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

 [350] (310) 



