46 JOURNAL OF I'ORESTKV 



v'hite pine type. The data show a total of 151 sporophores, both live 

 and dead, observed on a variety of slash and of hosts. Of the sporo- 

 phores, 89 were developed after, and 65 previous to the cutting, and 

 138 or 90 per cent of the total sporophores were found alive, with a 

 much smaller number (16) dead. All of the new sporophores were 

 found to be alive, and this indicates that 49 of the old ones remained 

 living up to the time of observation. The data in Table 1 indicates 

 that Trametes pini is by far the most active of the fungi present in 

 respect to the number of sporophores developed. Of the total sporo- 

 phores on the area, 61 were T. pini. Of these a large majority (93 

 per cent) were found alive. Seven different hosts were found bear- 

 ing these fruiting bodies which were developing on stumps, cull lots, 

 cull poles and cull parts of logs. These figures are all the more 

 important if it is considered that this fungus is one of the most 

 destructive agents in the rotting of valuable timber in the Northwest 

 region. The principal tree of the future crop, western white pine, is 

 one of the most common of its numerous hosts. The large number 

 of live sporophores developing upon the slash on this area is repre- 

 sentative of the conditions existing upon cut-over areas in the timber 

 regions of the Northwest where private logging is carried on. The 

 timber sales conducted by the Forest Service, due to the enforcement 

 of closer utilization policies, always show a marked improvement in 

 this respect over the operations conducted by individuals and con- 

 tractors upon private holdings. 



Tables 2 and 3 record data taken upon cut-over areas in Minnesota 

 and Oregon, respectively. These areas were cut under Forest Service 

 regulations, and show a marked difference in the number of sporo- 

 phores found, and also in the amount of cull material noted in com- 

 parison to the area of Table 1. The true difference in the areas is 

 not correctly shown by the total number of sporophores recorded in 

 the tables, since the sizes of the areas varied in each case, and the 

 Priest River area, due to climatic, topographic and type factors, is 

 normally more favorable to fungous development than the Oregon 

 area. The Oregon area is characterized by the following climatic 

 summary ^^ compiled from the reports of the United States Weather 

 Bureau: (1) scanty rainfall, (2) wide range of temperatures, (3) 

 low, absolute humidity, (4) rapid evaporation, and (5) an abundance 

 of sunshine. 



The Minnesota area, situated originally in a dense stand on a north 

 slope, presupposes the development of a larger number of sporophores 

 than that of the Oregon area, which site is flat, rolling, drier and less 



