20 
Mycologia 
Fig. 26. Cross section of “ pocket ” in process of formation. The cells 
have been delignified and have separated from one another. 
Fig. 27. Radial view of a pith ray (with other elements in the back-ground) 
showing the course of hyphae through the wood. Penetration of the wall 
occurs mainly through the pits. 
Fig. 28. Cross section of chestnut log showing seasoning check. The 
fungus tends to follow these checks into the deeper-lying tissues. 
Fig. 29. Radial section of chestnut wood showing fungus filament passing 
through bordered pits of prosenchyma. 
Fig. 30. Portion of pith ray and parenchyma cells of chestnut, tangential 
section. The intercellular space at (a) and the pits at (fc) have been enlarged 
through fungal attack. 
