Montana Forest Tree Fungi 



135 



of these trees in the state. The fungus also occurs on Populus angustifolia, 

 Sioux National Forest, P. deltoides, Missoula, P. balsamifera, Bearmouth, 

 Betula occidentalis, Libby, Abies grandis, Taft, Pseudotsuga taxifolia, Darby. 

 The fungus is frequently found on dead roots of living deciduous trees. 



Pomes conchatus Pers. on Betula occidentalis, Somers, Salix bebbiana, 

 Florence, Populus trichocarpa, Troy. The form Fomes salicinus Bull, is 

 occasionally found on Salix species. 



Fomes ellisianus Anderson on living Shepherdia, Sioux National Forest. 

 Common. 



Fomes everhartii Ellis on living trunks of Populus trichocarpa, Troy. 



Fomes fomentari'us Linn, on Betula occidentalis, Troy, Populus trichocarpa, 

 Neihart, P. tremuloides, Missoula. The form sometimes distinguished as 

 Fomes lobatus Schw. occurs. 



Fomes fraxinophilus Peck on Fraxinus sp., Sioux National Forest, on roots 

 of living trees. 



Fomes igniarius Linn, on Betula occidentalis, Missoula, Alnus tenuifolia, 

 Missoula, Prunus emarginata, Somers, P. demissa, Bearmouth, Acer glabrum, 

 Libby, Populus tremuloides, Monarch, P. angustifolia, Glendive, P. trichocarpa, 

 Troy. The fungus causes a serious heart rot in the living tree and continues 

 alive after the death of the host. 10 The form " nigricans " is occasionally 

 found. 



Fomes juniperinus Schrenk. One specimen on living Juniperus communis 

 may be referred to this species, Madison National Forest. 



Fomes officinalis Fr. on Larix occidentalis, Kalispell and Missoula, Pinus 

 ponderosa, Missoula and Evaro, Pseudotsuga taxifolia, Missoula. Causes a 

 serious heart rot in the living tree and remains living after the death of the 

 host, often fruiting in Poria-like form. 



Fomes pini (Brot.) Lloyd on Pinus ponderosa, Neihart, P. contorta, Ana- 

 conda, P. flexilis, Anaconda, P. albicatus, Hamilton, P. monticola, Troy, 

 Picea Engelmanni, Saltese, Abies grandis, Troy, A. lasiocarpa, Libby, Larix 

 occidentalis, Missoula, Pseudotsuga taxifolia, Missoula, Tsuga heterophylla, 

 Troy, Thuja plicata, Libby. F. pini causes a serious heart rot in the living 

 tree and remains living after the death of the host. . Trametes Abietis Karst. 

 and T. piceina Peck are thin forms and from observations of the same plants 

 during different seasons have perennial sporophores which may be stratified 

 at point of attachment and should be here referred. All forms show great 

 variation in pores, produce the same rot, and may be resupinate. F. pini 

 sometimes occurs in entirely resupinate form. In this region the thin forms 

 are not any more common on spruce than on other conifers. A plant repeat- 

 edly collected in Montana and throughout the Northwest and which occurs 

 only on Crataegus has been reported as belonging in this group. 11 Recently 

 specimens were sent to Lloyd who transmitted the following note to the 



10 Hartig. Zersetzungserscheinungen p. 115. 1878. 



Spaulding. Bureau of Plant Industry Bui. 147: 31. 1909; and in Science 

 28: 816. 1908. 



11 Weir, J. R. Notes on Wood-destroying Fungi Which Grow on Both 

 Coniferous and Deciduous Trees. — I. Phytopathology 4: 272. 1914. 

 writer: "Trametes piceana. On Crataegus. This species is common on 



