193 
I have not examined the perithecia of specimens collected later than 
August, at which period the spores are unformed, or at most only just 
beginning to show around the inner wall of the ascus. So far as this 
could be studied it accorded better with the description of the Euro¬ 
pean plant than most of those in my herbarium bearing the same name 
from any American locality. But none of ours that I have seen agree 
with the number of asci given in the description “ asci8-16,” while ours 
are 10-25, commonly the greater number. The form on Poa tenuifolia 
does not at all accord with the description and may yet be separated as 
a good species. This fungus is remarkably destructive to the Poa and 
may be found literally covering it—as if a bucket of whitewash had 
been spilt over the grass—even on dry, gravelly hills from 7,000 to 9,000 
feet high. Deer Lodge Valley is in altitude over 6,000 feet and the 
high hills and mountains in the vicinity, which are dry and nearly bare 
of other vegetation than a sparse growth of this grass, form a rich col¬ 
lecting ground for various Erysiphece. Erysiplie graminis on Poa tenu¬ 
ifolia will be found an excellent subject for those who wish to study 
the development of the mycelium from the conidia and the sexual or¬ 
gans and ultimate fruit from the mycelium. 
Unojnitla salicis, (DO.) Winter. Hosts: 8alix glauca (a form) Hel¬ 
ena (?) (Kelsey), Belt Mountains; 8. rostrata , Belt Mountains; 8. longi- 
’folia, banks of the Upper Missouri Biver, and Dillon; 8. amygdaloides , 
banks of the Upper Missouri Biver, valley of the Teton, and Sun Biver 
Valley; 8. cordata, banks of the Upper Missouri Biver; 8. flavescens 
and vars., Belt Mountains, Helena, Deer Lodge, Warm Springs Asylum, 
McCarthy Mountains, Melrose, Spring Hill; Populus tremuloides , Sand 
Coulee, Helena, Deer Lodge, Willis, Spring Hill; P. monilifera , banks 
of the Upper Missouri Biver, Deer Lodge, Dillon, Willis; P. balsam- 
ifera , Deer Lodge, Dillon, Willis, Spring Hill; P. angustifolia , Helena, 
Deer Lodge, Willis. This beautiful species is widely distributed and 
varies considerably on the different hosts, especially as regards append¬ 
age tips and number of spores in an ascus. In some instances the 
appendage tips are almost straight and scarcely swollen in well ma¬ 
tured specimens; but such variations are to be expected and are of no 
specific importance within certain limits. 
Phyllactinia suffulta, (Beb.) Sacc. Hosts : Hencliera parvifolia, 
Sand Coulee; Typha latifolia, Helena; Betula occidentalis, Heleua (Kel¬ 
sey) ; Cornus stolonifera, banks of the Upper Missouri Biver, Helena, 
Dillon, Willis, Spring Hill; common and variable; sometimes causing 
marked injury to the leaves of hosts. 
PoDOSPHiERA oxYACANTHiE, (DC.) DBy. Host: Prunus Virginiana, 
Sand Coulee, Mount Helena. More prone to attack the leaves of vigor¬ 
ous shoots in shady places. Not particularly abundant. 
Miscrosph^era symphoricarpi, Howe. Hosts: Symphoricarpus 
occidentalis, Sand Coulee, Belt Biver, Sun Biver Valley, Craig, Helena, 
Deer Lodge, Dillon, banks of the Big Hole Biver near Willis, banks of 
