IOWA ACADEMY OF SCIENCE 
87 
Albugo bliti (Biv.) Kuntze. 
This species was first noted at Newark, Del., where it was not uncommon on 
Amaranthus retrofiexus and appeared to have been fruiting for some time. The 
species was everywhere abundant in Indiana on the same host, as well as on 
Amaranthus hyhridus, A. spinosus, and Acnida canahina. In Iowa the fungus 
fruited on Amaranthus until frost. A total of eleven specimens (Delaware one, 
Iowa one, Indiana nine), were examined, but no oospores found. 
Albugo Candida (Pers.) Roussel. 
At the time of my visit to Newark this species appeared to be well on in its 
development, but rather scarce. It was observed only on BisymMum officinalis, 
a host upon which it was also found in Indiana. In the later state it was 
also observed in great abundance on Brassica arvensis, B. nigra, Bursa hursa- 
pastoris, Lepidium virginicum, Raphanus sativus, Roripa armoracea, and R. 
palustris. As one host passed its prime and began to cast its leaves the fungus 
appeared upon other hosts. Usually only the leaves were affected, but the pods 
of Raphanus and in addition the stems of Bursa were attacked. The only Iowa 
collection was on Brassica nigra, with a much hypertrophied stem. Fifteen 
collections (Iowa one, Delaware one, Indiana thirteen), were examined and 
oospores found in the pods of Raphanus (two collections), and Bursa, and in 
the stems of Brassica nigra. 
Albugo iPOMOEAE-PANDURANEAE (Schw.) Swingle. 
Two collections were made in August on Ipomoea hederacea in Indiana. While 
the fungus had appeared in Delaware much earlier in the season (as evidenced 
b 3 ^ both conidia and oospores collected by Dr. Cook and Mr. Jackson), the In- 
diana infections were very sparse and involved only a limited area of a few 
leaves, while no evidence of oospore galls could be found on the stems. 
Albugo portulacae (DC.) Kuntze. 
During the last third of August this species was abundant in Hamilton and 
Madison counties, Indiana, the last collections containing oospores. Careful 
search earlier in the summer failed to reveal this species. It persisted in Iowa 
until frost, but np oospores were found. 
Albugo tragopogonis (DC.) S. F. Gray, 
A single plant of Ambrosia artemisaefolia was found on July 29th near 
Greencastle, Indiana, with a number of the leaves affected by this fungus, which 
was not observed elsewhere during the season. Oospores were present. 
ScLERospoRA GRAMiNicoLA (Sacc.) Schroetor. 
A careful lookout was kept for this species, but it was not observed until 
after frost, when a single leaf of Chaetochloa glauca was found with oospores. 
Rhysotheca Halstedii (Farlow) G. W. Wilson. 
This species was first observed July 29th in the vicinity of Greencastle, In- 
diana, where a few infected leaves were found on one or two plants of Bidens 
frondosa. By August 13th the fungus was fairly abundant in this locality and 
by the 27th of that month scarcely a plant remained uninfected in all the In- 
