v.] TRAMETES RADICIPERDA. 151 



surprised me more than the accuracy with which Prof. 

 Hartig's figures reproduce the characteristic appear- 

 ance of the original specimens in his classical collection, 



FIG. 13. A block of the timber of a spruce-fir, attacked by Trantetes radicifferda. 

 The general colour is yellow, and in the yellow matrix of less rotten wood are 

 soft white patches, each with a black speck in it These patches are portions 

 completely disorganized by the action of the mycelium, and the appearance is 

 very characteristic of this particular disease. (After Hartig.) 



and I have tried to copy this in the woodcut, but of 

 course the want of colour makes itself evident. 



It is interesting and important to trace the earlier 

 changes in the diseased timber. When the filaments 



