7 ^ 2 , 
Journal of Agricultural Research 
Vol. V, No. 17 
methods were devised and recommended, and, as the bundling of seed¬ 
lings progressed, all visibly infected trees were removed and burned. A 
sharp watch was kept on the beds to remove new infections as they 
developed. 
Most of the infections were found along the north and east borders of 
the seedling beds. A large patch of CastUleja miniala was growing on 
the edge of a lodgepole pine ( Finns murrayana “Oreg. Com.”) stand 
near the creek bank directly northeast of the infected seedling beds and 
not more than 200 feet distant. The records of the weather station located 
on the grounds show that the prevailing winds blow both northeast and 
southwest, which is an important factor in spore distribution between the 
two hosts. Thus, these winds sweep northeast over the patch of CastUleja 
miniata from the 2-year-old yellow-pine seedlings and in reversing blow 
from the former to the latter. In this manner the aeciospores from the 
infected yellow pine are distributed to the eastilleja plants and the 
sporidia borne on the eastilleja leaves are transmitted to the young trees 
in the beds. On May 13, 1915, this fungus infection was found to be of 
serious importance on the yellow pine. 
From fresh specimens of the blister rust brought in to the greenhouse 
at Missoula, Mont., two plants of CastUleja miniata were inoculated on 
May 3, 1915. These were covered with oiled-paper bags and labeled. 
Six control plants of the same species were potted and bagged and 
kept in a separate part of the greenhouse. On May 23 uredospores 
developed on the underside of the leaves of the two inoculated plants, 
while the control plants remained normal. hater the teliospores de¬ 
veloped, sporidia being produced on May 29. Duplicate experiments 
were conducted at the field camp at Priest River, Idaho. AJciospores 
from the infected yellow-pine seedlings were sown on CastUleja miniata on 
May 14, and they gave positive results on June 11. The characteristic 
filamentous structure of the secia on the pine seedlings and these transfers 
of the fungus to eastilleja prove the fungus to be Peridermium filamen- 
tosum Peck. 
On May 13, 1915, the native lodgepole pine surrounding the nursery 
was found to be infected witli a trunk, a branch, and a needle form of 
Peridermium. The structure of the aecia of these forms indicated that 
the trunk and the branch forms were identical. The trunk form (known 
locally as the “hip canker” of the lodgepole pine) and the branch-gall 
form in the Rocky Mountain region have been commonly united under 
the name * ‘ Peridermium harknessii Moore.'' 1 hater they were transferred 
to Peridermium cerebrum Peck by Arthur and Kern. 2 
The following inoculations, made recently at Missoula, Mont., by the 
writers, prove that the “hip canker” and the gall-forming Peridermium 
of the lodgepole pine are both Peridermium fUamentosum . 
1 Harkness, H. W. New species of California fungi. In Bui. Cal. Acad. Sci., v. i, no. i, p. 37. 1884. 
•Arthur, J. C., and Kern, F. D. North American species of Peridermium on pine. In Mycologia, v. 6, 
no. 3, p. 133-138. 1914* 
