130 



Mycologia 



The Tenth Report of the Michigan Academy of Science con- 

 tains a paper by C. H. Kauffman (10: 63-84. 1908) on unre- 

 ported Michigan fungi for 1907, with an outline of the gastero- 

 mycetes of the state. This outline of the puff-balls and their 

 relatives should be exceedingly helpful to students of this group 

 anywhere in the northern United States. 



Mycorhiza-producing basidiomycetes are discussed in a short 

 paper by L. H. Pennington in the Tenth Report of the Michigan 

 Academy of Science (10: 47-49. 1908). After a brief review 

 of the work of others, the author describes the observations 

 which led him to add Boletus speciosus, Russula emetica, Tricho- 

 loma transmutans, and an additional species of Cortinarius to 

 the list of higher fungi that may produce mycorhiza upon the 

 roots of certain species of oak. 



Bulletin 144 of the Bureau of Plant Industry of the U. S. Dept. 

 of Agriculture contains an article by W. M. Scott and J. B. 

 Rorer devoted to the cause and treatment of the Apple Blotch, 

 a disease which is very destructive to apples and is widely dis- 

 tributed over the eastern part of the United States. The disease 

 is caused by Phyllosticta solitaria Ellis & Everh., and attacks 

 the leaves, branches and fruit, but is most conspicuous on the 

 branches and fruit. 



The first appearance of the disease on the fruit is a very small 

 light brown blotch. The blotch spreads until it attains often a 

 diameter of one half an inch. The fungus destroys only the 

 outer layers of cells and the continued growth of the tissues 

 beneath causes a cracking of the diseased areas, the cracks often 

 being one half an inch long. The disease mars the appearance . 

 of the fruit and unfits it for the market. 



The experiments of the authors of the article have shown that 

 the disease may be controlled by spraying with Bordeaux mix- 

 ture. Full details as to the application of the remedy are con- 

 tained in the bulletin named above. 



