PLATE XV. 



Figs, i, a-g. Barbula rig-ens. * 



Entire plant, natural size. 

 Leaves ( X 26). 

 Apex of a leaf ( X i35)- 

 Basal areolation ( X 135) • 

 Cells in the middle of a leaf ( X i35)- 

 Transverse section of the leaf in the lower part ( X i35)- 

 Transverse section of the leaf in the upper part ( X iSo). 

 Barbula treleasei. 

 Entire plant, natural size. 

 Leaf (X26). 

 Perichoetial leaf ( X 26). 

 Apex of the stem leaf ( X 60). 

 Basal areolation of same ( X i35)' 

 Cells in middle of same ( X I35)- 



Old capsule in dry state ( X 13)' 



Rhacom itrium cyclodicfyon . 



Entire plant, natural size. 



Leaves ( X 26). 



Perichaetial leaf ( X 26). 



Transverse section of a stem leaf ( X 100). 



Basal areolation of same ( X 270). 



Areolation in the middle ( X 270). 



Areolation of the apex ( X i35)- 



Old capsule in inoist state ( X 13)- 



Ulota alaskana. 



Entire plant, natural size. 

 4, by b, b. Leaves ( X 13)- 



Marginal areolation in the lower part ( X I35)' 



Capsule and calyptra ( X 13)- 



Capsule and lid ( X 13)- 



Capsule ripe, in dry state ( X 13 )• 



Same, in moist state ( X 13)' 



(352) 



