164 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



sahis Presl^ E. glaucus Buckley, E. Macounii Vasey, Hordeum juha- 

 tum L., and Triticum compactiim Host. 



Hosts easily infected by artificial inoculation: Agrop\ron cris- 

 tatiim J. Gsert., A. elongatum Host., A. tenerum Vasey, Bro- 

 mus tcctorum L., Hordeum vulgarc L., Triticum durum Desf. (some 

 varieties), Triticum monococcum L., T. vulgarc Vill. (a few vari- 

 eties.) 



Weakly infected by artificial inoculation : Agropyron dcsertorum 

 Schult, A. intermedium Beauv., A. repens (L) Beauv., Secale cer- 

 calc L., Triticum dicoccum Schr.. T. durum Desf. (some varieties), 

 T. vulgare Vill. (most varieties tried). 



The Puccinia graminis secalis, the authors state, can be summar- 

 ized as follows : P. graminis secalis has been found on the following 

 hosts in the field: Agropyron caniniim (L) Beauv., A. cristatum J. 

 Gaert., A. Smithii Rydb., A. rcpcns (L) Beauv., A. tcncrum Vasey, 

 Elymus canadensis L., E. robustus Scribn. and J. G. Sm., Hordeum 

 jubatum L., H. pusilhim Nutt., H. vulgarc L., Hystrix pattda 

 Moench., Secale cereale L., Sporobolus cryptandrus (Torr.) Gray. 



In addition to the above, the following have been easily infected 

 by artificial inoculation : Agropyron elongatum Host., Bromus tcc- 

 torum L., Elymus virginicus L., Hordeum spontaneum K. Koch, H. 

 vulgare pallidum Ser., H. vulgare pallidum subvar. pyramidatum. 



The following have been weakly infected artificially: Agropyron 

 imbricatum Roem. and Schult., A. intermedium Beauv., A. sibirictim 

 Beauv., Avena sativa L., Bromus purgans L., Triticum vulgarc Vill. 



Inoculated but not infected : Agropyron dcsertorum Schult., Agros- 

 tis alba L., A. stolonifera Vasey, Alopecurus geniculatus L., A. pra- 

 tcnsis L., Anthoxanthum odoratum L., Arrhcnathcrum elatius (L) 

 Beauv., Avena fatua L., Dactylis glomcrata L., Holcus lanatus L., 

 Koeleria cristata (L) Pers., Lolium pcrcnnc L., Phalaris canari- 

 cnsis L., Triticum compactum Host. 



Of the Puccinia graminis avcnce the authors make the follow- 

 ing summary with reference to this biologic form. Hosts found 

 naturally infected: Avena sativa L., A. fatua L., Agrostis exarata 

 Trin., Anthoxanthum puelli Lecoq and Lamotte, Dactylis glomerata 

 L. Koeleria cristata (L) Pers., Panicidaria pauciflora (Presl.) 

 Kuntze. 



Easily infected by artificial inoculation : Arrhcnathcrum elatius 

 (L) Beauv., Alopecurus geniculatus L., A. pratcnsis L., Bromus tcc- 

 torum L., Calamagrosiis canadensis (^lichx.) Beauv., Holcus lana- 

 tus L., Phalaris canarioisis L. 



