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Mycologia 



Polyporus anceps Peck on Larix occidentalis, Evaro, Pinus ponderosa, 

 Missoula. 



Polyporus arcularius Batsch on Alnus tenuifolia, Missoula. 



Polyporus aurantiacus Peck on Pseudotsuga taxifolia, Troy, Abies grandis, 

 Darby, Picea Engelmanni, Sylvanite. 



Polyporus benzoinus Fr. on Tsuga heterophylla, Taft, Pseudotsuga taxi- 

 folia, Darby, Abies grandis, Heron, Picea Engelmanni, Libby. 



Polyporus berkeleyi Fr. on Larix occidentalis, Libby. It sometimes attacks 

 the roots of living trees. 



Polyporus betulinus Bull, on Betula occidentalis, Troy. 



Polyporus borealis Fr. on Picea Engelmanni, Troy, Tsuga heterophylla, 

 Troy, Abies grandis, Evaro. It is sometimes found on dead roots of living 

 trees. 



Polyporus bru>ralis Pers. on Populus trichocarpa, Darby, Acer glabrum, 

 Troy. 



Polyporus caesius Schrad. on Populus trichocarpa, Anaconda, Salix sp., 

 Libby. 



Polyporus ceriftuus Berk, on Populus trichocarpa, Troy. 

 Polyporus chioneus Fr. on Thuja plicata, Darby, Abies grandis, DeBorgia. 

 Polyporus cinnabarinus /acq. on Betula occidentalis, Troy, Populus tricho- 

 carpa, Missoula, P. tremuloides, Neihart. Common throughout. 

 Polyporus crispellus Peck on Populus trichocarpa, Missoula. 

 Polyporus crispus Pers. on Populus tremuloides, Libby. 



Polyporus cryptopus Ellis, at base of dead Pinus contorta, slightly attached 

 to the bark, Bozeman. This species is usually found on grass roots. 



Polyporus dichrous Fr. on Thuja plicata, Troy, Populus trichocarpa, Mis- 

 soula, P. tremuloides, Monarch. 



Polyporus elegans Bull, on Amelanchier alnifolia, LoLo, Populus tremu- 

 loides, Neihart. 



Polyporus ellisianus Murrill on Pinus ponderosa, Hamilton, P. contorii, 

 Troy. 



Polyporus floridanus Quel, on Acer glabrum, Evaro. 

 Polyporus fragilis Fr. on Pinus monticola, Troy. 



Polyporus frondosus Fr. about roots of Pinus ponderosa, Missoula, 

 Pseudotsuga taxifolia, Troy. 



Polyporus fumosus Pers. on Populus trichocarpa, Missoula, P. tremuloides, 

 Sioux National Forest. 



Polyporus gilvus Schw. on dead stump of Alnus trifolia, Somers. 



Polyporus glomeratus Peck on Betula occidentalis, Libby. 



Polyporus griseus Peck on decaying trunk of Pinus monticola, Libby ; usu- 

 ally found growing in the forest mould. 



Polyporus leporinus Fr. on Pinus monticola, Libby. 



Polyporus leucospongia Ck. on Pinus contorta, Anaconda, Abies lasiocarpa, 

 Hamilton, Larix Lyalli, Hamilton. 



Polyporus lucidus Leysser on Pseudotsuga taxifolia, DeBrogia. 



Polyporus mollis Pers. on Larix occidentalis, Libby, Abies grandis, Evaro, 

 Pinus contorta, Troy. 



Polyporus osseus Kalch. on Betula occidentalis, Missoula. 



