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CIRCULAR 85 3. U. S. DEPARTMENT OF AGRICULTURE 



Figure 5. — Roots of Bourbon Dombeya bush dying from Clitocybe root rot. Bark 

 has been peeled off to show luxuriant growth of mycelial sheets developed dur- 

 ing hot, rainy weather. Note thick, waxy margin and perforate character of 

 older parts. 



gins of the mycelial sheets may be considerably thickened (fig. 5). 

 In addition to" mycelial sheets of considerable extent, there may also 

 develop flattened." narrow to broad, thalluslike structures of the same 

 color and either entire in outline or with numerous threadlike branch- 

 ing from the margins. These structures, which are essentially rhizo- 



