Dec. 1, 1924 
Diagnosis of Decay in Wood 
525 
Fig. 1 —Heart rot in Tsuga heterophylla caused by EcMnodontium tindorium (Indian paint fungus). < A.— 
Section through living tree showing the extent of decay with hollow cavity at H, typical rot at T, incip¬ 
ient rot at I, hidden phase of incipient decay beyond. The rot extends into the larger branches. B.— 
Cross section of the trunk showing relation of decay to sporophore and dead branch. C.—Tangential 
section of decayed wood showing the hyphae of the fungus penetrating tfye cell walls and decomposing 
them. Note the numerous bore holes. 
