UTAH ACADEMY OF SCIENCES 183 
Coville; Pinus fexilis (limber pine) and Pinus aristata 
(bristle-cone pine), &. cyanocarpa A. Nelson. Pseudot- 
suga mucronata (Douglas spruce) is parasitized by AR, 
Douglasti (Engelm.) Kuntze, from Bullion Canyon, 
Marysvale and southward, being especially conspicuous 
in the Abajo Mountains in San Juan County. Our cedar 
trees, especially Juniperus scopulorum and J. utahensis 
have large bunches a foot or more in diameter of the 
cedar mistletoe, Phoradendron juniperinum Engelm., 
especially conspicuous in the southernmost tier of counties 
in the State. 
Only the barest beginning has been made toward the 
collecting and determining of the fungi of Utah that 
attack forest trees. This is particularly true of the higher 
fungi which are classified together under the popular 
name of ‘“‘wood-rotting fungi’—those that caused so 
much concern during the war for fear they had caused 
incipient decay in the lumber used for airplanes. Conse- 
quently experts examined the timber carefully to see if 
there was any trace of these insidious foes which would 
cause a wreck, possibly at the most critical moment. The 
mycelial threads of these fungi penetrate the wood, and 
then secrete enzymes which digest the lignin of the cell- 
walls. Of course when this is done, the strength of the 
piece of wood is a thing of the past. Among the con- 
spicuous examples of these fungi occurring in Utah may 
be mentioned the “‘oyster-fungus”, (Pleurotus sapindus and 
Polystreatus) found on poplar-trees wherever wounded, 
especially when pollarded. These fungi are stemless 
horizontal mushrooms. One sometimes finds Jomes 
ignarius occurring regularly by the old leaf-scars on the 
trunks of Populus tremuloides, The writer has made col- 
lections in Daniel’s Canyon and in the Fish Lake Moun- 
tains. Again, a “punk” found on the birch (Betula fonti- 
nalis),is Polystictus cinnabarinus, easily recognized by its 
cinnabar-red color in contradistinction to the common 
Polystictus versicolor also occurring in the State on the 
same and other hosts.: The latter fungus is often known 
as “shelf-fungus’”’. Polystictus stuppeus often occurs on 
dead poplar stumps—quite common at Payson. Poly- 
