Montana Forest Tree Fungi 



133 



Polyporus perennis Linn, on damp mossy ground in thick woods, Belton, 

 Troy, and LoLo ; sometimes on decaying logs. 



Polyporus picipes Fr. on Populus trichocarpa, Missoula, P. tremuloides, 

 Neihart. Common throughout. 



Polyporus pubescens Fr. on Betula occidentalis, Darby, Alnus tenuifolia, 

 Missoula, Salix sp., Belton. Thin forms are sometimes referred to P. velu- 

 tinus Fr. The form of this plant known as P. Grayii (P. pubescens var. 

 Grayii) is commonly associated with the type. 



Polyporus radiatus Schw. on Alnus tenuifolia, Libby. 



Polyporus rheades Pers. on Populus tremuloides, Libby, growing from 

 wound in living tree. 



Polyporus sartwellii Berk, on Betula occidentalis, Libby. This is really an 

 abnormal form of Polystictus hirsutus. 



Polyporus schweinitzii Fr. on Pinus ponderosa, at Missoula, Ashland, and 

 Troy, P. monticola, Troy, P. contort a, Haugan, Larix occidentalis, Missoula 

 and Somers, Picea Engelmanni at Darby, Saltese. Causes a serious root and 

 trunk rot in living trees. 



Polyporus semisupinus Berk, on Alnus tenuifolia, Heron. 



Polyporus spumeus Sow. on Populus trichocarpa, Libby and Missoula. 

 Causes a heart rot in living trees. 



Polyporus stipticus Pers. on Pinus monticola, Sylvanite, Pseudotsuga taxi- 

 folia, Saltese. 



Polyporus sulphureus Fr. on Pinus ponderosa, Libby, Pseudotsuga taxi- 

 folia, Darby, Larix occidentalis, White Fish. Fairly common. Occasionally 

 attacks the roots of living trees. 



Polyporus umbellatus Viviani. At base of Picea Engelmanni, Libby. 



Polyporus undosus Peck on Abies grandis, Darby. 



Polyporus volvatus Peck on Pinus ponderosa, Missoula, P. contorta, Boze- 

 man, Abies grandis, Evaro, Picea Englemanni, Troy. 



Poria 



Poria attenuata Peck on Pinus contorta, Sioux National Forest, P. monti- 

 cola, Libby, Larix occidentalis, Thompson Falls. 



Poria aurantiaca Rost. (P. aurea Peck) on Pinus monticola, Libby. 



Poria callosa Fr., resupinate form of Trametes serialis, Pinus ponderosa, 

 Florence, P. contorta, Libby. 



Poria carbonaria B. & C. on Pseudotsuga taxifolia, Evaro, Pinus contorta, 

 Anaconda. Apparently always on burned trunks. 



Poria contigua Pers. on Thuja plicata, Libby. 



Poria corticola Fr. on bark and wood of Populus trichocarpa, Missoula, 

 P. tremuloides, Anaconda. 



Poria fulvida Ellis on Betula occidentalis, Bearmouth. 

 Poria homaema Berk, on Picea Engelmanni, Evaro. 



Poria laminata Murrill on Alnus tenuifolia, Libby. Forms extensive 

 patches 2 to 3 feet long with a conspicuous stratose pore structure. 



Poria marginella, Peck on Picea Engelmanni, Thompson Falls, Pinus con- 

 torta, Anaconda. 



Poria medulla-panis (Pers.) Fr. on Pinus monticola, Libby, Pseudotsuga 

 taxifolia, Evaro. 



