PLATE XXXIII. 

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



Figs, i, a-i. Barbula saundersii. 



Entire plant, natural size. 

 Leaf (X 26). 



Apex of the same ( X 60). 



Part of a transverse section of the same ( X lOo). 

 Perichsetial leaf ( X 26). 

 Basal areolation of a stem-leaf ( X ^SS)- 

 Cells in the middle of the same ( X 270). 

 Capsule and lid ( X ^S)- 

 Capsule and peristome ( X ^S)* 

 Orthotrichum fenestratum. 

 Entire plant, natural size. 

 Leaves ( X ^S)- 



Transverse section of a leaf ( X 60). 

 Transverse section of the costa ( X 270). 

 Basal areolation of a leaf ( X i3S)' 

 Areolation in the middle ( X i35)« 

 Areolation of the apex ( X ^SS)* 

 Capsule and lid ( X ^S)- 



Caljptra(Xi3)- 



Capsule, deoperculate, in moist state ( X ^S)* 



The same split lengthw^ise ( X ^S)- 



Astomate ( X i3S)- 



A tooth of the peristome ( X i35)' 



Upper part of the same ( X 270)- 



(3H) 



