60 THE LARCH CANKER 
Fig. 26, B, which is an enlarged drawing of the top right- 
hand corner of fig. 26, a, shows in greater detail the forma- 
tion of this new cork layer ; PH is here the normal phellogen 
or cork cambium which makes cork on its outside. The 
Fria. 26, a and B.—Cork layer across base of branch. For description, 
see text. 
new cork is formed by a new phellogen ph, which is 
developed right across the cortex and phloem, and makes 
a downward turn as it approaches the cambium. I¢ is in 
direct continuation with the outer phellogen at E, and 
forms, as it were, a side branch of this phellogen. It passes 
usually transversely across the cortex and phloem (it may 
be oblique) until it reaches the layer outside the cambium, 
