May 1903] 
For?n of Aecidium Hibisciatum 
109 
The teleutospores are very dark brown (the sori appear 
black), thick-walled, verrucose, the pedicels 50-65 p long and 5-8 
p wide. Some spores are shown in fig. 6. Recorded measure¬ 
ments mostly from material obtained by cultures are: 28x21, 
26x15, 30x17, 30x18, 29x19, 27x18, 27x21, 28x18, 30x21, 27x18, 
27x20, 27x19 p . 
Explanation of Plate II. Puccinia lateripes B. & Rav. Figs. 1-3 
natural size; figs. 4-6 magnified 350 diameters. Fig. 1. Portion of stem 
from culture plant showing sori of pycnidia and secidia on stem and leaves. 
Fig. 2. Leaf with uredo and some teleuto sori, obtained by cultures. 
Fig. 3. Leaf with teleuto sori collected preceding year. Fig. 4. 3Ecidio- 
spores obtained by cultures. Fig. 5. Uredospores obtained by cultures. 
Fig. 6. Teleutospores. 
THE ALTERNATE FORM OF AECIDIUM HIBISCIATUM. 
W. A. KELLERMAN. 
An enormous quantity of the FEcidium on Hibiscus moscheu- 
tos occurring on the margins of Buckeye Lake, a reservoir eight 
or nine miles long, located forty miles east of Columbus, af¬ 
forded good opportunity to study its teleutosporic connection. 
Several Rusts were likewise very abundant in the immediate vin- 
cinity of the clumps of this host. It seemed at first necessary to 
regard the Puccinia on Carex scoparia as the alternate of the 
FEcidium but that is doubtless connected with a stage on Erigeron. 
Then Uromyces burrillii was considered in the case though abund¬ 
ant in a very few places on the Reservoir margins. Cultures in¬ 
stituted gave only negative results, and this clue was necessarily 
abandoned. Next it was concluded that since Puccinia polygoni- 
amphibii was present and immediately adjacent to most of the 
clumps of the Hibiscus, it might be the missing link, but unsuc¬ 
cessful cultures effectually demonstrated the erroneous supposi¬ 
tion. 
Success with cultures was attained at last when the next 
probability was more seriously laid hold of, namely, that Puccinia 
muhlenbergiae Arthur might be the teleutosporic stage in ques¬ 
tion. Flost plants had been early placed in the green house, 
March 20, and tardily resumed active growth furnishing excel¬ 
lent host plants for the operations. Likewise the Rust was 
placed in the same congenial temperature and the pre-season ex¬ 
periments could then be carried on with assurance of success if 
the suspected connection was not improperly guessed. 
Sowings were made April 24 (Exp. No. 146) on Hibiscus 
moscheutos using the teleutospores of Puccinia muhlenbergiae 
