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Mycologia 



Porta obducens Pers. on Picea Engelmanni, Darby. 



Poria pereffusa Murrill on Picea Engelmanni, Troy. This is a doubtful 

 determination but conforms to description with the exception of the host. 



Poria pulchella Schw. on Pinus ponderosa, Missoula, Acer negundo, Sioux 

 National Forest. 



Poria punctata Fr. on Betula occidentalis, Troy and Missoula. Common. 



Poria rufa Schrad. on Pinus monticola, Sylvanite, P. contorta, Boulder. 

 Observed frequently in wide checks of fire-killed trees. 



Poria sanguinolenta Schw. on Pinus monticola, Libby. Occasionally found 

 in old branch knots on living trees. 



Poria semisupina Berk., resupinate form of Polyporus semisupinus Berk., 

 on Alnus tenuifolia, Evaro, Acer glabrum, Libby. 



Poria subacida Peck on Picea engelmanni, Troy, Abies grandis, Darby, 

 Larix occidentalis, Libby. 



Poria sitbspadicea Fr. on Pseudotsuga taxifolia, Troy, Pinus ponderosa, 

 Haugan. 



Poria undata Pers. on Abies grandis, Darby, Pinus contorta, Haugan. 

 Poria vapor aria Pers. on Abies grandis, Darby. 



Poria violacea Fr.. on Pinus ponderosa, Evaro, Picea Engelmanni, Libby. 

 Poria weirii Murrill on Thuja plicata, Darby, Troy, and Libby. 

 Poria xantha Fr. on Pinus monticola, Libby. 



Polystictus 



Polystictus abietinus Dicks, on fallen timber of all coniferous species. 

 Sometimes found growing in wounds of living trees. Common. 



Polystictus biformis Klotsch on Populus trichocarpa, Bearmouth, Alnus 

 tenuifolia, Saltese. 



Polystictus conchifer Schw. on Ulmus Americana, Arden. 



Polystictus hirsutus Fr. on dead wood of deciduous trees and shrubs ; wide 

 range of hosts. Sometimes found on coniferous wood. 



Polystictus pargamenus Fr. on Populus trichocarpa, Ashland, growing in 

 wounds of living tree, on P. tricocarpa, Wisdom, Salix lasiandra, Belton. 

 New range for this species, but the specimens are in every way typical. 



Polystictus Sequoiae Copeland on Thuja plicata, Darby. 



Polystictus versicolor Fr. on all species of hard woods throughout, occa- 

 sionally on coniferous wood. The plants known as Polystictus hirsutulus Schw. 

 and P. zonatus Fr. are also found occasionally. 



Fomes 



Fomes annosus Fr. on Pinus monticola, Trout Creek, P. ponderosa, Libby, 

 P. contorta, Sylvanite, Larix occidentalis, Libby, Populus trichocarpa, Troy. 

 Parasitic on the roots of living trees and continues to live after the death 

 of the host. 



Fomes applanatus Pers. The typical European form with brown soft crust 

 on Populus tremuloides, DeBorgia. Fomes leucophaeus Mont., the typical 

 American form with a pale or white hard crust, is very abundant and has 

 been collected on Populus trichocarpa and P. tremuloides throughout the range 



