Parmelia rudecta


 

 

 P. rudecta is one of the most common foliose lichens on trees. Occasionally it is found on rocks. The wrinkled, bluish-green thallus has white pores in the upper surface. The center of the thallus becomes covered with isidia. The lower surface is buff to tan. It often grows with Pseudoparmelia caperata which is a contrasting yellowish-green color.