17 
Both kinds of weeds, when badly infested, lose their healthy 
color,so much so that Mr. Kelsey was able to detect the worst 
cases of the disease from the dwarfed and sickly appearance of 
portions of the plant above ground. 
Heretofore, so far as the books at hand, Saccardo, Zopf, Woro- 
nin, Sorauer, F rank, Eycleshymer, and others, instruct, the hosts 
Fic. 3. 
which have been definitely recorded are Brassica oleracea, with its 
Varieties of cabbage, cauliflower, kale, Brussels sprouts, Brassica 
Kapa, Raphanus sativus, Iberis umbellata and Matthiola incana. Itis 
erefore interesting to add two other genera to the list, and in the 
manner above intimated, namely, from suspicions that blossomed 
