191 
Elkhorn (Kelsey), Belt River, Belt Mountains, Sand Coulee, Helena, 
main range of the Rockies, Deer Lodge, and Willis; E. glahellm , Belt 
Mountains; E. divaricatus , Sand Coulee, Belt Mountains; E. Canaden¬ 
sis, Sand Coulee, Helena, Dillon; E. corymbosus, Belt Mountains; E. 
armericvfolius , Helena; E.strigosus , Sand Coulee; Selenium autumnale, 
banks of the Big Hole River, near Willis; Helianthus annum , Helena 
(Kelsey); H. Calif or nicus, var. Utahensis , Helena (Kelsey); Gaillardia 
aristata, Mount Helena; Lactuca pulchella , Sand Coulee; Artemisia 
dracunculoides, Belt Mountains, Belt River, Cora Creek, Otter Creek, 
Chinook, Valley of the Teton, Sun River, Fort Shaw, Fort Assinni- 
boine, Sand Coulee, Craig, Helena, Garrison, Deer Lodge, Butte, Sil¬ 
ver Bow Junction, Silver City, Willis, Melrose, Glendale, Spring Hill; 
A. Ludoviciana , Belt Mountains, Valley of the Teton, Belt River, Ot¬ 
ter Creek, Helena, Craig, Deer Lodge, Dillon, Warm Springs Asylum, 
Willis, Great Falls, Sand Coulee, Sun River; A. discolor and forms, 
Belt Mountains; Bigelovia graveolens and vars., Falls of the Missouri 
River, Helena, Deer Lodge, Warm Springs Asylum, Dillon, Glendale, 
Melrose, Willis, Chinook, valley of the Teton, Spring Hill; B. Douglasii 
and forms, Mount Helena, McCarthy Mountains, Willis, Deer Lodge, 
Spring Hill; Ghrysopsis villosa and forms, Sand Coulee, Deer Lodge, 
Willis; Grindelia squarrosa , Sand Coulee, Helena, Deer Lodge, and 
Willis; Cnicus undulatus , Sand Coulee, Helena, Deer Lodge, McCarthy 
Mountains near Willis, valley of the Teton; Gutierrezia Eutliamice , 
Sand Coulee and Deer Lodge. 
A number of the forms of Erysiphe dehor acearum, DC., to be found 
on the hosts given are far from typical—especially on certain of the 
Compositce , and are placed here because at present there is no other 
place to put them. In some, one, in others another character fails, and 
again nearly all may fail; not the least important of which is to be con¬ 
sidered the remarkable variation in the number of spores to an ascus. 
In the Verbena hastata specimens the asci contain frequently but one 
spore and that of but average size. The peritliecia of Phacelia Menziesii 
specimens are very dark, in marked contrast with the rather pale ap¬ 
pendages. All parts of the plant are overrun by the fungus. The fun¬ 
gus covers Echinospermum BedowsMi entirely. Sometimes large patches 
of the host growing in dry gravelly places along railway tracks are almost 
white with growth of mycelium. Parietaria debilis suffers so severely 
from this fungus that its leaves rot on the stems, and if one attempts to 
pull a leaf off it is no uncommon tiling for an irregular piece to come 
away between one’s fingers, leaving the other dilapidated portion still 
hanging. In Compositce the Artemisice, with Aster foliaceus , Aster can- 
escens , and Aster commutatus suffer most severely. Cultivated plants do 
not appear to be infected. In connection with the fungus on Cnicus un¬ 
dulatus , collected at Helena, I found the conceptacles of Cicinobolus 
Cesatii , DBy. They were confined chiefly to the conidia-bearing hyplne, 
pale in color and small, probably young, for no spores were seen to 
