10 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 50 



Fiji. 10. — In an elm .suflFerinif from wetwood, toxic sap of the diseased 

 wood may ooze through a crack in the trunk, kill the cambium, and cause 

 the bark to separate from the wood. In this picture is shown the trunk of a 

 wetwood-affected tree from which part of the bark has been cut away. The 

 toxic sap has oozed out through the crack (dark line indicated by arrow) 

 and killed the surrounding cambium. The bark has separated from the wood 

 to form an elongate pocket. 



