v.] 



TRA METES RADICIFERDA, 



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 Tranietes radiciperda. 

 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 



