PLATE 55 



A comparatively early stage of host reaction to invasion by Urophlyctis alfalfae. 

 The cavities produced by the invading fungus can still be traced from the exterior 

 into the parenchymatous tissue. A few of the cells which are about to be entered 

 by the advancing fungus show some hypertrophy. The division of the cells beneath 

 the epidermis has begun. 



