29 



23 BOTANICAL GAZETTE [january 



3. Puccinia Impatientis (Schw.) Arth. Teleutospores from 

 Elymus virginicus L. sown on Impatiens aurea Muhl. 



4. Puccinia subnitens Diet. Teleutospores from Distichlis 

 spicata (L.) Greene sown on Chenopodium album L. 



5. Puccinia amphigena Diet. Teleutospores from Calamovilfa 

 longifolia (Hook.) Hack, sown on Smilax herbacea L. and 5. his- 

 pida Muhl. 



6. Puccinia simillima Arth. Teleutospores from Phragmites 

 Phragmites (L.) Karst. sown on A?iemo?ie canade?isis L. 



7. Puccinia Caricis-Solidaginis Arth. Teleutospores from 

 Carex Jamesii Schw. and C. stipata Muhl. sown on Solidago cana- 

 densis L. and 5. serotina Ait., and also from the former Carex 

 host sown on 5. caesia L., 5. ulmifolia Muhl. and S. rigida L. 



It will not be out of place to emphasize again the desirability 

 of making field observations upon the association of aecidial, 

 uredo, and teleutosporic forms within small areas. There is little 

 chance for progress in establishing the connection of spore-forms 

 through cultural work, except by acting upon the hints derived 

 from field notes. Any acute observer is likely to be able to make 

 one or more important deductions of this kind during a season, 

 which may lead to valuable discoveries upon testing by cultures. 

 If collectors would bear the matter in mind, the perplexing tangle 

 of our knowledge of the heteroecious rusts would soon largely 

 yield to experimental study. 



I cannot too heartily express my appreciation of the kind- 

 ness of Professor W. A. Kellerman, Mr. W. H. Long, Jr., Rev. J. 

 M. Bates, Dr. J. J. Davis, and Mr. E. W. D. Holway, for their 

 assistance with material, and especially with suggestions derived 

 from their field observat ons. Without such help much of the 

 work recorded in this report could not have been undertaken. 



Purdue University, 

 Lafayette, Ind. 



