189 
at tlie north and east of the main divide. Montana contains 143,770 
square miles, and is more than twice as large as all the New England 
Statesput together, so that some of our species have a very fair range. 1 
have found that where a host common throughout both sides of the main 
divide of the Rockies occurs, the fungus will be found throughout a’so. 
Spiiasrotheca mors uvai, (Schw.) B. & C. Hosts : Ribes floridum, 
Helena (Kelsey); R.cereum , Helena and Great Falls ; R.rotundifolium, 
Sand Coulee. Mycelium at first white, but soon becoming dark brown, 
forming a dense felt over the succulent twigs and young leaves of Ribes 
rotundifolium; occurring also upon the berries. On Ribes cereum it is 
less frequent, and usually grows in small isolated belts around the young 
twigs. At times very injurious to the gooseberry. Unusually prevalent 
this year. 
SpiiiEROTHECA Castagnei, Lev. Hosts: Geranium incis-um , Hel¬ 
ena (Kelsey), Sand Coulee, Belt Mountains; Geranium Richardsoni , Belt 
Mountains; Gilia linearis , Sand Coulee, Belt Mountains, Helena, Deer 
Lodge, Willis, Glendale, Dillon, Spring Hill, and Valley of the Teton; 
Gilia'*-gracilis, Belt Mountains; Shepherdia argentea , Valley of the 
Teton, throughout on Gilia linearis , frequently killing it; cover¬ 
ing all parts of the plaut above ground. The thousands of black peri- 
thecia, mixed with the gray mycelium, make infested plants look as if 
covered with small particles of black soil mixed with dust. Rare on 
Gilia gracilis. On Shepherdia argentea the disposition of the mycelium 
was much like that of Sphcerotheca mors-uvce; but more delicate, color¬ 
less, or faintly creamy-yellow tinged, and not so evident; that is to say, 
it attacks the tender twigs of the tree and surrounds them, causing in¬ 
jury to the leaves above by perversion of nutrition. It is also very par¬ 
tial to the leaf axils. My specimens were collected July 16, this year. 
The ascospores are formed, but the fungus is not mature. Mr. J. B. 
Ellis, who kindly compared my specimen with one from Dr. Farlow, 
agrees with me that it must be referred as above. Common in the 
mountains on Geranium incisum and G. Richardsoni , often thickly cov¬ 
ering the petioles, leaves, stems, and even the petals, sometimes caus¬ 
ing the leaves to curve to the ground with the weight of fungus and de¬ 
stroying them. 
A quite remarkable form of this species was found on Reuchera parvi- 
folia. Anderson No. 212. Sand Coulee, Cascade County, Mont., De- 
cember 3,1888. Its most marked peculiarity is in the mycelial threads, 
which have a tendeucy to grow to a great length without ramifying to any 
extent, and end in long, slender, cylindrical, colorless threads. More¬ 
over, they show marked constrictions at nearly regular intervals, at 
which they are septate. The appendages can be readily distinguished 
from the mycelium, are strongly colored for about one-third to one half 
their length, and then gradually fade to the almost hyaline tip. Like 
the mycelium, they are septate and show a tendency to elongate without 
