LICHENS OF THE STATE OF WASHINGTON 41 



The small size and the gray soredia make this an easily recognized 

 Sticta. 



5. Sticta quercisans Ach. Syn. Lich. 234. 1814. 



Lobaria quercisans (Ach.) Michx. Fl. Boreali-Am. 2nd ed., 324. 1820. 



Thallus drab (R), cinnamon brown (R), or reddish brown, small to 

 medium sized, cartilagineous-coriaceous, lobes narrow, smooth, densely 

 isidiose on the margins, margins crenate or undulate; below dark brown 

 or almost black, covered with short hairs, interspersed with naked, concave, 

 white, or pale buff-colored cyphellae; rather loosely attached to the sub- 

 stratum. I have seen no fruiting material from the state. 



On bark or moss: Clallam Co.: Port Angeles, Coleman's, 1914, Foster 

 2635 (W). Thurston Co.: Gate, 1911, Foster 1926 (W). 



The narrow lobes with isidiose margins make this rather an easy species 

 to recognize ; not widely distributed in the state. 



