PLATE 52 



A, C, D. — Urophlyctis pluriannulatus . B. — Urophlyctis alfalfae. 



A. — Portion of actively growing thallus of U. pluriannulatus dissected from gall on 

 leaf of Sanicula menziesii, including a turbinate cell ta with a nearly mature resting 

 spore ra; ta is completely evacuated, having produced 7 turbinate cells of the next 

 order, in one of which tba peripheral segments have been delimited, another, tbb, 

 has produced two turbinate cells of the tertiary order tea and tcb, as well as a developing 

 resting spore rb. Approximately X 847. 



B. — Abnormally enlarged hyphae and turbinate cells of U. alfalfae, showing con- 

 spicuous thickening of the walls. X 860. 



C. — Peripheral portion of actively growing thallus of U. pluriannulatus, similar to 

 A, showing 8 turbinate cells of the second order, of which 7 have produced turbinate 

 cells of the last order as well as resting spores. Approximately X 847. 



D. — Nearly mature resting spore of U. pluriannulatus, viewed from polar end, 

 showing 22 haustoria in zonate arrangement. Approximately X 847. 



Drawn with the aid of the camera lucida. 



