114 The Botanical Gazette. [April, 
But of wider range than any species yet mentioned is the mil- 
dew of the pea, Erysiphe Martit Lev. which renders it almost 
impossible to grow late peas. This fungus preys upon plants 
of at least six large and quite widely separated families and 
therefore in any neighborhood may have ample means at 
hand for keeping up its abundant stock of specimens. 
The mildew of the cabbage and turnip, Peronospora parasili- 
ca (P.) is not an unmixed evil however, for because of its wide 
range it attacks the shepherd’s purse, various mustards, anda 
number of other weeds. The hosts enumerated in a list re- 
cently consulted were thirty-five, and most of these are com- 
mon plants in all parts of our country. Another fungous 
disease of the cabbageand turnip, namely, the club root, Plas- 
modtophora Brassice W. while as yet not recorded outside 
of these two hosts and the radish, very likely is at home with 
many of the other plants of the same order, but root diseases 
Pia out of sight are not easily found unless specially looked 
or. ; 
with upon wild vines of both our common species. 
Spherotheca Mors-Uve (Sch.) producing the gooseberty 
mildew and crippling an industry in this country, is fout 
upon several species of our wild gooseberries. The write T 
calls collecting fruit and young twigs entirely covered W 
the thick brown felt in the cations of Colorado, where the® 
were no cultivated bushes perhaps within five hundred mies 
In like manner the anthracnose, Gleosporium Ribis (Libs 
that causes the premature dropping of foliage, is commyy 
several species of currant. im- 
The blackberry rust, C@oma nitens (Sch.) is an especially . 
portant illustration of the relationship of wild plants t© Oe 
close of kin that are cultivated in the garden. This conspict 
