IOWA ACADEMY OF SCIENCE 
diana localities visited. The infection was as complete as any seen during the 
season, all the leaves being affected and the lower ones killed outright, hut no 
oospores were found. A single clump of Erigeron annuus was also found in- 
fected. 
I 
Rhysotheca viticola (B. & C.) G. W. Wilson. 
This species was quite abundant on both wild and cultivated species of Vitis 
when they were first examined in July. Conidia were collected on leaf, petiole, 
tendril, and young twigs. In some vineyards the disease was responsible for 
heavy loss of fruit, but none of the diseased berries were examined for oospores. 
Among the twelve specimens collected one was upon seedling of cultivated grapes. 
Plasmopora pygmaea (Unger) Schroter. 
A single leaf of Anemone quinquefolia was found infected with this species in 
New York in April. 
Bremia lacttjcae Regel. 
Collected on Lactuca canadensis in Hamilton and Putnam counties, Indiana, 
between July 23d and August 3d. All this material had the appearance of being 
quite old and indicated that the conidia had been produced for some time past. 
Of the three specimens collected none contained oospores. 
Peronospora ALTA Puckel. 
A single infected leaf of Plantago major was found in Hamilton County, In- 
diana, on August 22d. No oospores were found. 
Peronospora effusa (Grev.) Rabenh. 
Late in July leaves of Chenopodium aWum began to show the yellow spots 
caused by this fungus and by the middle 9 f August scarcely an uninfected clump 
could be found. Of the four Indiana specimens examined one contained oospores. 
Peronospora euphorbiae Fuckel. 
During the later part of July EuphorMa maculata was noticeably affected 
v/ith the conidia of this species which rapidly increased in abundance. The two 
collections from Indiana show no oospores. 
Peronospora parasitica (Pers.) Fries. 
During the early spring in New York this fungus attacked great numbers of 
seedlings of Lepidium virginicum, but soon run its course. The previous sum- 
mer the fruit and infioresence was frequently destroyed during midsummer, 
but this season no such attack was noted before reaching Newark, Delaware, 
where the fungus was evidently just making its appearance. The same host 
was found sparingly affected in Indiana. Here a single dump of Brassica nigra 
and a single bed of Raphanus sativus were found infected. No very robust 
growth of the fungus was observed this season. Of the five specimens (New 
York one, Delaware one, Indiana three), examined the only oospores found were 
ir termingled with those of Albugo Candida on a pod of Raphanus. 
