Fig. 29. HEMLOCK TRUNK WITH 

 FRUITING BODIES OF A FUN- 

 GUS. 



Fig. 30. BLACK 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, others attack only dead wood. 



