PLAJJ'TS OF NORTH ELBA 151 



Evernia furfuracea [L) Mann 

 Dead branches of trees. Common. Most often on coniferous trees. 



E. furfuracea Cladonia Tuckm. 

 Tamarack, balsam fir and spruce. Indian pass and the cold region 

 west of Mt Wallface. Both the species and the variety are generally 

 sterile. The thallus in both sometimes becomes partly or almost wholly 

 black. 



Evernia Prunastri (Z.) Ach. 



Trunks and branches of Tamarack. Occasional. Sterile. 



Usnea barbata (Z.) Fr. 



Gray moss 



Branches of trees. Common in low swampy woods and exhibiting 



several varieties. 



U. barbata florida Fr, 



Vicinity of Lake Placid. Atkinson. Eastern part of the town. 



Abundantly fertile. 



U. barbata hirta Fr. 



Known by its minute fibrils and its numerous soredia which often give 



it a pulverulent appearance. 



U. barbata plicata Fr. 



Vicinity of Lake Placid. Atkinson. 



U. barbata dasypoga Ft'. 

 This is the long slender pendulous variety with the thallus and its 

 branches beset with spreading or horizontal fibrils. It is generally 

 sterile. It grows from branches either dead or living and gives to the 

 trees it inhabits a peculiar untidy and unthrifty appearance. 



Usnea longissima Ach. 

 Long gray moss 

 Similar to U. barbata dasypoga in habitat and general appearance, and 

 sometimes growing with it, but of a paler color with a more slender and 

 delicate thallus. It is less abundant. Sterile. Hidden swamp. 



Alectoria jubata (Z.) Fr. 

 Branches of trees. Common. Similar in habitat to species of Usnea 

 but at once distinguished by its brown or blackish brown color. It often 

 grows intermingled with other lichens on dead branches of tamarack, 

 balsam fir and spruce. Sterile. 



A. jubata implexa Fr. 

 This differs from the typical form in its long slender pendulous thallus. 



