56 BOTANICAL GAZETTE. *° [ March, 
ing the present season it has been met with only a few times 
on A. biennis, growing in moist places, in cuts along a rail- 
road track, and only in small scattered patches upon the 
lower leaves. : 
Peronospora sordida Berk. has been a good illustration of 
the influence of moisture upon the development of mildew. 
The host, Scrophularia nodosa, is a common plant on the 
banks of streams, especially when the slope is steep and with- 
out sod. The Peronospora was frequently looked for, but it 
appeared in its usual abundance in only one place, and this 
was at a bend in a stream, where the host grew close to the 
water and tall rubber boots were required to carry the col- 
lector over dry-shod. : 
Peronospora Lophanthi Farl. on Lophanthus scrophularie- 
folius is a rare species, in the state, and was not found at the 
college before the present year. It can not, therefore, be 
used as an element in the argument in considering the influ- 
t more than one-tenth as much 
was found this year upon the same area, namely, a young 
cherry orchard, left under the Same culture as last season. 
It was, however, discovered this year upon Hungarian grass 
(Setaria Italica), where it distorted the host in the same 
manner as on the foxtail, as illu 
2. at the mildew ma 
conjecture, but the species now co i 4 
feronospora calotheca DBy., not in Dr. Farlow’s lists, is 
ordinarily frequently met with upon species of Galium. This 
until October 14, when it was col- 
lected in abundance upon seedling bed- 
opment of the Peronospore. 
he genus Cystopus has four ‘known species in the state. 
Cystopus candidus Lév., like Peronospora parasitica, 1s 
confined to the C ®, and like it, also lives over the 
seedling plants which spring uP 
observed in particular with shep- 
