. 69 



18 Journal of Mycology [Vol. 12 



uredospores in plenty on May 23, and would doubtless have been 

 followed by teleutospores in due time, had the culture been con- 

 tinued. These results in transferring the rust from field corn 

 to sweet corn, and the reverse, are in accord with those obtained 

 by Kellerman. 20 



At the same time the first sowings were made, April 17, tel- 

 eutospores were also sown on a seedling Zea Mays, under favor- 

 able conditions, but no infection resulted. The drop cultures, 

 which are made just previous to every sowing, showed that the 

 teleutospores germinated freely, but the few uredospores inter- 

 mixed were not viable. In this case, at least, the teleutospores 

 appeared to be incapable of infecting the host from which taken, 

 and in so far agree with the general rule regarding grass and 

 sedge rusts. 



16. Puccinia Polygoni-amphibii Pers. In 1904 21 it 

 was possible to verify in a measure the work upon this species 

 by Dr. Tranzschel of St. Petersburg, by sowing aecidiospores 

 ivomG eranium maculatum and obtaining teleutospores on Poly- 

 gonum emersum. This season the reverse order of sowing was 

 tried. Teleutospores from P. emersum obtained in this vicinity 

 were sown April 15 on G. maculatum and G. Robertianum, with 

 no infection of the latter, but most abundant infection of the 

 former, showing spermogonia April 23 and aecidia May 1. A 

 second sowing was made April 27, using the above two hosts 

 and also G. pusillum, and again infection occurred only upon G. 

 maculatum, which showed great numbers of spermogonia May 3, 

 and aecidia May 9. These results agree with common observa- 

 tion, for the aecidium on G. maculatum {A. sanguinolentum 

 Lindr.) is common in the United States, while no aecidia have 

 yet been reported on G. Robertianum or G. pussillum. 



17. Puccinia Helianthi Schw. A sowing of teleuto- 

 spores, taken from Helianthus grosse-serratus growing on the 

 grounds of the University, was made May 17 on H. grosse-serra- 

 tus and two plants of H. annuus with equally abundant results 

 in each case, spermogonia showing May 25, and aecidia June 2. 



18. Puccinia lateripes B. & Br. After many vain 

 attempts to secure good fungous and host material of this species 

 for culture work, the present season's excellent results have given 

 much satisfaction. All the material was obtained near Lafayette, 

 Ind. Sowings of teleutospores from Ruellia ciliosa were made 

 April 25 on both R. ciliosa and R. strepens, with equally positive 

 results in both cases, showing spermogonia May 5, and aecidia 

 May 18. Another sowing of the same material was made on 

 R. strepens May 2y, which gave spermogonia June 5, and aecidia 



20 Cf. Jour. Mycol. 11: 27. 1905. 



21 Jour. Mycol. 11 : 59. 1905. 



