16 BULLETIN 360, U. S. DEPARTMENT OF AGRICULTURE. 
The brooming of the branches of the lodgepole pine by mistletoe is 
as characteristic as for the other hosts mentioned. Frequently the 
Fic. 13.—Typical broom of the weeping-willow type on Doug- 
las fir caused by Razoumofskya douglasii. Note the long, 
flowing branches. Sometimes these branches are 8 to 10 
feet long. 
without any particular hypertrophy of the 
branch asa whole. This condition is more apt 
to occur in dense stands. Observations by the 
writer on Picea engelmanni, P. mariana, 
Abies grandis, A. lasiocarpa, A. concolor, A. 
magnifica, Tsuga heterophylla, T. merten- 
siana, Pinus monticola, P. albicaulis, P. flexi- 
lis, P. attenuata, and other conifers show that 
brooming of the branches is a common phe- 
nomenon attending mistletoe infection of 
these species. | 
The weight of these brooms on many coni- 
fers is frequently sufliicient under stress of 
winds and rain to cause the branches to split 
entire tree is involved, 
but more often only 
the lower branches. A 
few instances have 
been noted where the 
parasite hung in long 
festoons from the sey- 
eral infected branches 
Fic. 14.—Typical brooms of old 
infections on western larch 
caused by Razoumofskya lari- 
cis. Very few of the origi- 
nal branches remain, and 
they are heavily broomed and 
covered with lichens. The 
old branches are replaced by 
short serubby secondary 
branches. Note that two of 
the original branches still re- 
main, but are dead. 
from the trunk, or to break farther out if the brooms are located far 
out from the trunk. This very commonly occurs in the case of 
