INJURIES INDUCED BY PLANTS ,25 



specimens four to ten years old of Abies pectinata, Tsuga Mer- 



tensiana, Pseudotsuga Douglasii, Picea Sitkcensis, Pinus Strobus, 



and Larix europcea. 



The part of the wood that was attacked extended to about 



2j acres. In the winter of 1889-90 the wood which then existed 

 namely, a thin stocking of pines, larches, 

 and spruces about fifty years old was 

 stubbed, and in the spring of 1890 the 

 area was replanted chiefly with three- to 

 four-year-old plants, which were inserted 

 partly in pits and partly in notches. 



In the month of June disease had 

 appeared among the plants. The leaves 



/U 



FIG. 63. Hymenium , 

 consisting of a, 

 paraphyses ; b, se- 

 creting-tubes ; c, 

 asci, which contain 

 eight spores each. 



P'lG. 64. a, spores of Rhizina ; b, ditto, 

 twenty-four hours after sowing ; c, 

 ditto, twenty-four hours later ; </, the 

 spore c more highly magnified. 



rapidly died and fell off, and the fungus appeared to be gra- 

 dually spreading over the area. The ascophores were found 

 almost exclusively at a distance of about ten inches from the 

 plants, but on the surface of what had been the pit. But 

 between the plants also, on the bare ground covered with raw 

 humus, numerous ascophores were met with. The soil was 

 sandy in character, covered with raw humus and bilberry-bushes. 



