" BEARD-MOSS " LICHEN 



137 



first of these types belong two very common lichens found almost 

 everywhere on tree trunks. The " Beard-Moss " (Usnea bar- 

 bat a) consists of tufts of greyish-green branching threads. When 



FIG. 38. "Beard-Moss" Lichen (Usnea), with fruits. 



young the tufts are rigid and shrubby, but later they droop 

 and become looser. The plant is more often found without 

 spore fruits than with them ; the fruits are saucer-like, 

 rather large, and fringed with threads at the edges (Fig. 38). 



