183 
[Seymour. 
Pacific Railroad. Beginning at St. Paul, Aug. 21, short stops and 
hurried collections were made at various points until Sept. 23rd. 
The dates and localities of collecting are as follows : 
August 21, St. Paul, Minnesota, 
“ 22, Brainerd and Detroit, Minnesota, 
“ 23, Fargo, Dakota, 
“ 25, Valley City, Dakota, 
“ 26, Jamestown, “ 
“ 28, 29 and 30, Bismarck, Dakota. 
September 2, Medora, Dakota, 
“ 3, Miles City, Montana, 
“ 4, Billings, “ 
“ 6, Livingston, “ 
“ 8, Bozeman, “ 
“ 11 and 12, Helena, Montana, 
“ 15, Sand Point, Idaho, 
“ 17, Wallula, Washington, 
“ 19, Thompson Falls, Montana, 
“ 23, Minneapolis and Lake Minnetonka, Minnesota. 
A few other localities are mentioned in the list, represented by 
specimens picked up at points where the train stopped. Species 
distributed in exsiccati from this collection are so noted. 
For aid in the determinations, I am indebted to Drs. W. G-. 
Fallow and P. Magnus and especially to the lamented Dr. Winter. 
CH YTRIDI AGEiE . 
Synchytrium decipiens , Far!., on Amphicarpcea monoica , plenti- 
ful ; Bismarck, Dakota. 
PERONOSPGRE^J. 
Peronospora Halstedii, Farl.,on Rudbeckia laciniata; Fargo and 
Valley City, Dak. 
Peronospora ribicola , Schrt., Jahresbericht d. Schles. Gesellsch. 
1883, p. 179 ; Plasmopara ribicola , Schrt. Krypt. FI. Schles. Vol. 
hi, p. 238, where it is described as follows : “Rasen fleckenweise, 
sehr locker, weiss. Conidientrager straff aufrecht, 2-4 mm. hoch, 
mit 3-5 aufrecht abstehenden graden Aesten, meist in eine End- 
spitze auslaufend ; Aeste grade, die untern mit 3-5 graden Seitenas- 
ten ; Endastchen grade, verschmalert, abgestutzt. Conidien kurz 
elliptisch, 15-20//. lang, 11-13/4 breit, mit flacker Papille. Keimung 
