Fis. 29. HEMLUCK TRUNK WITU 

 FRUITING BODIES OF A FUN- 

 GUS. 



Fis. 30. BI^CK BIRCH TRUNK AT- 

 TACKED BY TWO DIFFERENT 

 SPECIES OF FUNGI. 



Fig. 31. CHESTNUT POST ATTACKED BY BROWN RoT (POLYPORUS 



SULPHUREUS). 

 Some fungi attack only living wood, ethers attack only dead wood. 



