20^ MobiEfeiir tOBtesT economy. 



over. And thus has been made apparent how extremely 

 limited is the number of species of fungi which are destruc- 

 tive to the Austrian pine. Serious injury is done to it 

 only by the Peridermium pini and the Lophodermium pin- 

 astri, in so far as we have seen ; injury of lesser magnitude 

 and scarcely calling for consideration, is done by the 

 ■Peridermium ohhngisporiwm, and Leptostroma pinastri, and 

 also in the long run by the Phoma erythrellum and the 

 Russthau. With regard to some kinds, as for example, the 

 Hutpilsen, must the question in regard to injury being 

 attributable to them be left undecided. Notwithstanding 

 this, however, and considering that the most deadly malady 

 of all, the schutte, has not as yet shown itself on the black 

 pine in Austria, at this time the expression is quite justi- 

 fiable — the black pine is one of the healthiest of forest 

 trees in the land, and the one least injured by parasitic 

 fungi.' 



As has been stated in regard to the natural history and 

 culture of the black pine, it may be stated here that this 

 paper has been translated and inserted solely in illus- 

 tration of how the pathology of trees is studied by 

 foresters in connection with the advanced forest science of 

 the day. 



