Plate V. 



I. Moist peristome of Polytrichum Ohioense R. & C. 2. The same dry. 

 3 Dry peristome of Georgia. 4. The same wet. 5 Four teeth of 

 the peristome of Catharinea undulata (L.) Web. & Mohr. 8. Dry peris- 

 tome of Barbula amplexa Lesq. 7. A perfect peristome of the same 

 moistened 6 An older peristome of the same moistened. 



