412 



rilEDINEAE. 



with resin, and as the same process goes on in bast and rind, 

 the turpentine overflows from fissures or wounds in the bark. 

 During the summer the mycelium grows amongst the dividing 

 cambium-cells and kills them. \Yheiv this occurs the year- 



Pic. '246. P< fill, ,-ni'i ii.ii jiiiii (<-<ii-t'i'-fi!<i\ 

 Young twig bearing numerous aecidia. 

 (v. Tubeuf pilot.) 



Flo. "245. Pi.i'iili I'nui'n, /lini (''a, 'tli'r>l<i). 

 Hranch and lateral twigs distinctly 

 swi .lien where attacked. They also bear 

 aecidia. (v. Tubeuf phot.) 



ring ceases to thicken, but as the mycelium seldom succeeds 

 during the first year in killing the cambium all round a 



