I. Plant of FruUania Eboracensis growing upon birch bark. 



II. Under side of same magnified, showing lobules and underleaves. 



III. Under side of F. Asagrayana, showing as in II., also row of discol- 



ored cells. 



IV. Upper view of same. 



V. Perianth of F. Eboracensis. 



F. Oakesiana Austin. This is a small local species found in the moun- 

 tains of New Hampshire and Vermont. It is usually reddish-brown in color, 

 and is readily distinguished by its reddish color and its large lobule. Rare. 



F. RiPARiA Hamp. {F. cEolotis Nees). On trees and rocks, growing in 

 ■depressed tufts, usually green. Its distinguishing feature is the usually ex- 

 planate lobule, which is small and lanceolate. Underleaves distant, bifid 

 about i^, entire or nearly so. From New England westward to Minnesota 

 and southward to Gulf of Mexico. 



F. SQUARROSA (Bl. R. ct Nccs.) Dumort. Plants usually in wide, loose 

 mats, but sometimes closely appressed to the tree or rock on which it grows. 

 When dry the leaves are closely imbricated and appressed to the stem. 

 When moist the leaves are strongly squarrose, a condition found in no other 

 American species. The lobule is inflated in its outer and upper parts, but 

 ^not at the base. Underleaves close together, orbicular, entire or nearly so. 

 Perianth compressed, with short beak, and bearing numerous tubercles. 

 •Connecticut to Ohio and southward. 



