42 



Mycologia 



only perfectly healthy plants passed. The life of valuable orna- 

 mental trees may be greatly prolonged by promptly cutting out 

 all diseased parts and covering cuts with tar. Spraying is of 

 no use in stopping the fungus after it is once started. Diseased 

 chestnut trees should be cut down and utilized as soon as possible. 

 For the present the planting of chestnuts anywhere east of OhiO' 

 is not advised, but there is no apparent reason why chestnut 

 orchards west of Ohio cannot be kept free from the disease. — 

 F. J. Seaver. 



The Blister Rust of White Pine. — Bulletin 206 of the Bureau 

 of Plant Industry of the United States Department of Agricul- 

 ture contains the results of the investigation of this disease by 

 Mr. Perley Spaulding. The growth of the reforestation move- 

 ment in America has caused a steady increase in the importation 

 of young white pine stock, with the consequent danger of intro- 

 ducing destructive insect or fungus pests. 



Cronartimn rihicola, which was discovered in 1855, was later 

 found to be only a stage of Peridermium Strohi, the blister rust 

 of various species of Pinus. This fungus has been introduced 

 from Europe into numerous localities in America. 



The methods of preventing and combating this disease are as 

 follows: stop importing five-leaved pines (for which the fungus 

 has a preference) and Ribes (which constitutes the alternate host 

 for this fungus) and raise these plants at home; keep five-leaved 

 pines separated from Ribes if either is imported ; where the disease 

 is already present all diseased pines should be removed and 

 burned; diseased Ribes bushes should also be removed and 

 burned. 



Rigid inspection of all imported stock, or the entire prohibition 

 of the importation of five-leaved pines and Ribes, should be com- 

 pelled by legislation. — F. J. Seaver. 



The Relation of Parasitic Fungi to the Contents of the Cells 

 of the Host Plants (I. The Toxicity of Tannin). — The above is 

 the title of an extensive paper by Dr. M. T. Cook and Mr. J. J. 

 Taubenhaus published as Bulletin No. 91 of the Delaware Col- 



