96 



HEART-ROT 



The dense blackness of the patches, makes it impossible 

 to observe the details of development in this stage until 



Flo. 34. — BliU'k S])Ofk in tlio wood of tlit^ larch causod by Fnnie.i annosris. 



TraiiHVdr.so section (x(UIO). ^ 



the black pigment has been removed. But the fact that 

 these dai-k-wall(>d hyphae are bleached by the action of 

 almost any acid makes investigation possible. Convenient 



