Trees and Timber 



383 



CEDAR, RED {Juniperus) 



Rusts ^"^ {Gymnosporangium sps.). — Several distinct 

 species of the parasite occur on Juniperus, some of which 

 produce the usual "cedar-apples," others produce cankers or 

 witches-brooms on the branches, or spots on the leaves. 

 They are usually of but small significance to the cedar tree 

 itself unless exceptionally abundant. See apple rust. 



Fig. 200. — "Cedar-apple," 



iingus. Original. 



White-rot "^"^^ {Fomes juniperinus v. Sch.). — In this dis- 

 ease holes appear in the heartwood, extending longitudinally 

 with a partition of sound wood between. These cavities 

 eventually may unite to form tubes throughout the tree. 

 The wood between one cavity and the next is not the normal 

 red, but is somewhat browned, and the holes themselves are 

 coated with a brilliant white lining. The cavities, partially 

 filled with a velvety reddish-yellow mycelium, may be from 

 4-9 cm. long. The pore-bearing sporophore is hard and 



