3-i JOURNAL OF FORESTRY 



were merely suspended, attached to the bark. Many of the trees (loi 

 out of 195) that were infected disclosed in the borings taken that the 

 rot was in its typical stage (well established), had not produced sporo- 

 phores while in the forest, and had not done so since the thinning. In 

 fact, the decayed wood of such trees had taken on the nature of a soft 

 rot, differing in every respect from the typical decay produced by the 

 fungus under the favorable conditions of the closed forest. 



These comparisons show a balance in favor of the thinning influence 

 in every case, and also show that the method of bringing the two stands 

 on a more nearly comparable basis has aided in securing more nearly 

 correct results. These data indicate that the opening of a stand to full 

 sunlight after a period of suppression apparently influences the devel- 

 opment of the attacking fungus. 



Fungi and fungous fruiting bodies are tolerant of shade. This point 

 need. not be discussed. Since moisture forms one of the prime necessi- 

 ties of plant life, especially fungi, it must follow that the shaded, and 

 therefore more humid, situations would be the most favorable ones. 

 j\Iuch sunlight and exposure to unfavorable drying conditions increases 

 the transpiration at the hymenial surface of Echinodontium fiiictoriidit. 

 just as in the case of green leaves, with the result that this layer soon 

 dries out and dies. This is. no doubt, the effect produced upon some of 

 the sporophorcs found on the trees of the cut-over area by the opening 

 of the stand and the extreme change in density from 225 trees per acre 

 in the original stand to 50 trees per acre left after the logging opera- 

 tions. Several live fruiting bodies of the fungus were produced on this 

 area, yet the conditions of increased vigor and light, the diminished 

 shade and moisture, and the absence of many open injuries are ex- 

 tremely adverse to the germination and development of fungous spores. 

 Provided thinning caused a very appreciable restrictive influence upon 

 the fungus infecting hemlock and grand fir, it would not be advisable 

 to depend upon such a method of forest sanitation in outlining means 

 of controlling the spread of this fungus. In cases where the destruc- 

 tion by fire of all infectious cull material and standing infected trees 

 left on an area after logging cannot be enforced, it might be found 

 beneficial to leave as open a stand as possible in order to create an en- 

 vironment less favorable to the development and spread of the fungus. 



SUMMARY 



The main facts brought out by the data, compared with the analysis 

 of trees taken from an adjacent uncut area of the same type and age 



