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IOWA ACADEMY OF SCIENCE Vol. XXVI, 19i't 



Teliospores movmted in water and measured gave the following: 

 16-20x22-32 microns. Standard 18x24 (thirty-five measured). The 

 teliospores on red clover measured 12-18x18-25 microns, on white 

 clover 17-19x22-26 (thirty measured in each case). Thus it would 

 appear that the teliospores on mammoth clover are larger but this 

 fact is not of much importance since taxonomists differ so much 

 in reporting spore measurements for these rusts. The following 



Fig. 8'J. — Uredinia opening. 



table will show the measurements given to teliospores on different 

 hosts by different authors. Germinating teliospores are shown in 

 figure 90, numbers 4 and 5. D=A germinating sporidium. 



All mciisuremcnts in Microns. 



As the rust on T. repens L. is treated by most of these authors 

 as that on T. medium, this would complicate matters still more. The 

 teliospores conform to the shape, structure and color of the rusts 

 on white and red clovers. There seems to be no safe basis on 

 which to separate the sj^ecies on examination of teliospores. 



Feridial Cells. — Five different sections of leaves from two differ- 

 ent plants of mammotli clover bearing .Tcia, were killed in Fleni- 



