PLATE 53 



Urophlyctis pluriannulatus: 



Section of leaf of Sanicula menziesii, showing development of parasite within gall. 

 Some of the fungus thallus appears to have dropped out of the section in the course of 

 manipulations, as is indicated by the large unoccupied gaps; la, primary turbinate cell; 

 tb, tc, turbinate structures or cells of successive orders, the former completely evacu- 

 ated, the latter in early first or second nucleated stage; ra, rb, resting spores produced 

 by turbinate cells of successive orders: hn, host nuclei considerably enlarged as result 

 of influence of parasite. Note the similarity in development of parasite to U. alfalfae 

 and the relatively slight influence of parasitism on host anatomy. Drawn with the aid 

 of the camera lucida. X 860. 



