PLATE XXXI. 

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



FIGS. I, a-e. Trichostomum sitkanum. 



i, a. Entire plant, natural size. 



I, b, b. Leaves ( X J 3)- 



i, c. Basal areolation of a leaf ( X I 35)- 



i, d. Areolation in the middle ( X 1 35)- 



1, e. Areolation in the upper part ( X 1 3S) 



2, a-i. Pottia Jieimii beringiana. 

 2, a. Entire plant, natural size. 

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



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



2, d. Part of the same ( X !35)' 



2, e. Basal areolation of the leaf ( X 1 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 dry state ( X I 3)- 



3, a-i. Barbula brachypoda. 



3, a. Entire plant, natural size. 



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



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



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



3, e. Basal areolation of the leaf ( X J35)- 



3. f. Areolation in the middle ( X 



3, g. Areolation of the upper part ( 



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



3, '. Portion of the annulus ( X6o). 



[350] (310) 



