PLATE XXXIII. 

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



FlGS. I, a-i. Barbula saundersit. 



i, a. Entire plant, natural size. 



1,6. Leaf (X 26). 



I, c. Apex of the same ( X 60) 



i, d. Part of a transverse section of the same ( X ioo). 



i, e. Perichaetial leaf ( X 26). 



i,f. Basal areolation of a stem-leaf ( X !35)- 



i, g. Cells in the middle of the same ( X 2 7)- 



I, //. Capsule and lid ( X 13)- 



1, i. Capsule and peristome ( X I 3)- 



2, a-n. Orthotrichum fenestratum. 

 2, a. Entire plant, natural size. 

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



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



2, d. Transverse section of the costa ( X 2 7)- 



2, e. Basal areolation of a leaf ( X 1 35)' 



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



2, g. Areolation of the apex ( X 1 35)- 



z, h. Capsule and lid ( X X 3)- 



2, i. Calyptra (X*3)- 



2,j. Capsule, deoperculate, in moist state ( X 1 Z)> 



2, k. The same split lengthwise ( X J 3)- 



2, /. A stomate ( X 135)- 



2, m. A tooth of the peristome ( X I 35) 



2, 11. Upper part of the same ( X 2 7)' 

 [354] (3H) 



