Montana Forest Tree Fungi 



137 



Trametes septum Berk, on Acer negundo, Sioux National Forest. A plant 

 is occasionally collected from old yellow pine stumps which is in every way 

 typical and should be referred here. 



Trameies serialis Fr. on Pinus ponderosa, Boulder, P. contorta, Anaconda, 

 P. monticola, Troy. 



Trametes suaveoleus Fr. on Populus trichocarpa, Missoula, P. tremuloides, 

 Monarch, and on various Salix spp. throughout the state. The species some- 

 times causes a heart rot in living trees. 



Trametes tenuis Karst. (7\ setosus Weir), on Pinus monticola, Troy, P. 

 ponderosa, Darby, Larix occidentalis, Evaro. 



Trametes variiformis Peck on Larix occidentalis, Darby. 



Daedalea 



Daedalea unicolor Fr. on deciduous trees, common throughout the state. 

 A light colored form of this species is designated by Lloyd as D. ochracea. 

 Hennings recognized an Irpex-like form as D. unicolor var. hydnoidea. Both 

 forms are common on birch. 



Daedalea confragosa Fr. on Salix sps., Missoula, and Neihart, Populus 

 tremuloides, Libby. All the usual variations occur. 



Lenzites 



Lenzites saepiaria Fr. on all species of conifers and occasionally on wood 

 of deciduous trees, rarely a wound parasite. Common throughout the state. 



Lenzites betulina Fr. on dead wood of Betula occidentalis, Libby. 



Lenzites heteromorpha Fr. on Pseudotsuga taxifolia, Evaro, Abies grandis, 

 Libby, Tsuga heterophylla, Troy, Pinus monticola, Heron. These specimens 

 are probably only in part correctly referred. The material shows great varia- 

 tion. The plant is coarse, white with white context and the hymenium may 

 be either lamellate, daedaloid, or with large angular pores 0.4 to 1 cm. deep 

 and 2 to 5 mm. broad. The spores are hyaline 8-1 1 by 3-4 fx. This plant or 

 a closely related form seems to have been named Trametes hexagoniformis by 

 Murrill. A specimen sent to Mr. Lloyd has been so referred. The accom- 

 panying photographs {pi. 6) show quite plainly the form variations of this 

 plant on Pseudotsuga taxifolia. 



Lenzites trabea Fr. on Betula occidentalis, Haugan, Primus demissa, Libby, 

 Pinus contorta, Boulder. 



Favolus 



Favolus europaeus Fr. on dead branch of Fraxinus viridis, Glendive ; small 

 weathered specimen but typical except color. 



Office of Investigations in Forest Pathology, 

 Bureau of Plant Industry, 

 Missoula, Montana. 



