248 



MAXVAL OF TREE DISEASES 



accompanies the decay, the affected wood splits into cubes by 

 radial and circumferential cracks. The mycelium then grows 

 into and fills the cracks and forms tightly woven sheets (Fig. 4S). 



Fig. 4S. — Brown checked wood-rot iu oak. 



The sporophores of the sulfur fungus are easily recognized. 

 They emerge in late summer from old branch wounds or di- 

 rectly from the bark where the mycelium has decayed the 

 sapwood. At first they appear as one large or several small 

 sulfur-yellow, soft and watery kndbs of mycelium. These 



