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 Polygon 1- am phibii 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 
from Geranium 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 27, which gave spermogonia June 5, and aecidia 
20 Cf. Jour. Mycol. 11 : 27. 1905. 
21 Jour. Mycol. 11 : 59. 1905. 
