PLATE 52 



Cronartiuni ribicola: 



A. — ^A section of a yotmg telial column. Note the overlying peridial cells (a) and 

 the row arrangement of the developing teliospores. The epidermal cells have been 

 torn off. X 355- 



B.— A later stage in the development of the telial column. Note the shape of the 

 tip cells and the character of the parenchyma-like cells (a) surrotmding the base of 

 the young column (of. PI. 55, C). The cells near the base of the column are binu- 

 cleate, while those at the tip are uninucleate. X 355. 



C. — A longitudinal section of a mature column. X 250. 



D. — Higher power view of the same section, showing the arrangement of the indi- 

 vidual spores, and the size of the nuclei. X 1,050. 



E. — A cross section of a small mattne column. X 525. 



