PLATE 49 

 Urophlyctis alfalfae: 



A. — Section of epidermal region of young foliar structures, showing young primary 

 turbinate cells ta-tg, the first products of infection, within epidermal cells. Note 

 attachment to cuticular wall by attenuated beak, increase in number of fungus nuclei 

 during growth of turbinate cells, and pathological enlargement of host nuclei hn, 

 in invaded cell, knx being normal host nucleus. 



B. — Section of young foliar element, showing wall of invaded epidermal cell dis- 

 rupted and advance of secondary turbinate cells tbc-tbe into underlying tissue. One 

 of the other secondary turbinate cells, tbb, is forcing its way down along the host cell 

 wall, while another, tba, has been reflected toward the cuticular wall; ta, sporogenous 

 cell of primary turbinate structure. 



C. — Section of turbinate cell, showing 3 evacuated peripheral segments pa-pc. A 

 nucleus is passing through the narrow isthmus connecting the nearly evacuated sporo- 

 genous cell with the resting spore, the elongated nucleole following the achromatin. 



D. — Section of maturing resting spore, showing 8 nuclei and a central vacuole con- 

 taining 4 granules staining red. 



E. — Section of mature resting spore, showing numerous red-staining granules in 

 center and 5 nuclei. 



F. — Section of maturing resting spore, showing 1 1 normal nuclei and 4 enlarged nuclei 

 in center, the latter apparently degenerating. 



Drawn with the aid of the camera lucida. X &60. 



