Explanation of Plate 1. 



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

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



LEPTO LKEDINE.E. 



1. Uromyces RL'DBECKi.t Arth lis: Hohv. on Rudbeckia Uiritiuita. 



2a. PucciNiA CIRC.E.« Pers. on Circtea lutet'mna. 



2b. PucciNiA ciRc.t:^ Pers. on Circcea alpma. 



3. PucciXiA LOBEH.E Gcr. on Lobelia syp/irlitica. 



4a. PuccixiA siLPHii Schw. on Silflilum lacitiiaium. 



4b. PucciNiA -SILPHII Schw. on Silphiicm perfoliatum (leaves). 



4c. PucciNiA SILPHII Schw. on SHphuim perfoliatinn (stems). 



5. PucciNiA CONGREGATA Ell. & Hark, on Heuchera micrantha. 



6a. PucciNiA HEUCHERA (Schw.) Diet, on Mitella diphylla. 



6b. PucciNiA HEUCHER,« (Schw.) Diet, on Mitella ntida. 



7. PucciNiA CURTIPES Howe on Heuchera americana. 



8. PUCCIXIA DAYI Clinton on Steironema ciliatum. 



