IOWA ACADEMY OP SCIENCE 
Peronospoea polygoni Thum. 
A clump of Polygonum scandens was examined on July 24tli and showed 
rather an, abundant infection of this fungus, the majority of the conidiophores 
being immature. The fungus increased in abundance throughout August. Of 
the two Indiana collections neither showed oospores. 
Peronospoea potentillae de Bary. 
This species was first observed on Potentilla monsepalensis July 24th, when 
the infection appeared to be quite old. No more conidiophores were found after 
August 1st. Neither of the two Indiana collections contain oospores. 
While the present paper is not devoted entirely to the Indiana Peronosporales 
the majority of the data was collected in that state. It is perhaps not remiss 
to add that all the species recorded from that state were collected except seven. 
Of these six are known only as spring forms and the seventh is confined to 
more northern portions of the state than were visited. 
