Explanation of Plate III. 



All figures uniformly magnified 470 diameters (drawn under a magnifica- 

 tion of 625 diameters and reduced to 470 diameters in engraving). 



LEPTO-UREDINE.E. 



14. PuccixiA PORPHYROGENiTA Curt. on Cortius canadensis. 



15a. PuccixiA MALVACEARUM Mont. on Altfuca rosea. 



15b. PucciNiA MALVACEARUM Mont. on Malva bofealis. 



15c. PucciNiA MALVACEARUM Motit. On Alalva pafvi/lora. 



16. PucciNiA VARioLANS Hark, on Aplopapfus squarrosus. 



17a. PucciNiA HOLBCELLi Rostr. on Arabis arcuata. 



17b. PucciNiA HOLBCELLI Rostr. OH Aral'ts arc iiaf a {geriTi tel ). 



