PLATE 53 



Cronariium ribicola: 



A drawing to show the intimate relation of the mycelium of the parasite to the 

 host cells. /)/>, Phloem parenchyma; jc, sieve cells; c, cambium cells; f, tracheids; 

 rdp, resin-duct parenchyma. The number of haustoria represented as entering the 

 cells in this drawing is not abnormally large. The drawing was made from two serial 

 sections from the same area by means of a projection apparatus and a camera lucida 

 and has been diagrammatized only so far as was necessary to bring some of the elements 

 to a proper level for drawing. In a few cases nuclei, which were not present in the 

 sections, were supplied for both host and parasite cells. Note the different shapes 

 and sizes of the haustoria and the general character of the hyphse lying between the 

 cells. X 500. 



