Notes and Brief Articles 



161 



A disease of the walnut tree in France is said by Paravicini to 

 be due to the attacks of Favolus europaeus, one of the common 

 polypores ordinarily considered non-parasitic. According to this 

 investigator, the fungus enters the trunk through wounds and is 

 frequently found associated with other fungi. 



Professor E. T. Bartholomew, of the Department of Botany 

 of the University of Wisconsin, has accepted a research pro- 

 fessorship in the Graduate School of Tropical Agriculture at 

 Riverside, California, in connection with the University of Cali- 

 fornia. His special work will be the investigation of the diseases 

 of lemons and other citrus fruits. 



Professor H. M. Fitzpatrick, of Cornell University, has made 

 arrangements to teach in the summer school of the University of 

 Michigan. He has just completed a monograph of the Corynel- 

 iaceae, which will appear in part in the July number of Mycologia. 



Tyrosin in the fungi is discussed by C. W. Dodge in the 

 Annals of the Missouri Botanical Garden (6: 71-92. 1919). 

 He investigated the chemistry of the tyrosinase reaction in cer- 

 tain species that turn blue or black on exposure to the air, and 

 found : " ( 1 ) that the tyrosinase reaction is not a deamination, 

 although it is possible that deaminases may exist in the same 

 organism with tyrosinase; (2) that the tyrosin molecule is synthe- 

 sized into a larger, more complex molecule, in which part of the 

 carboxyl groups is either split off as carbon dioxide, or more 

 probably bound in the molecule so that it will not react with 

 alkali." 



" fitudes sur la biologie et la culture des champignons super- 

 ieurs " is the title of a paper of 116 pages and many illustrations 

 published by Monsieur G. Boyer at Bordeaux in 1918. Cultures 

 from spores were usually unsatisfactory, so he was forced to use 

 portions of the hymenophore. The best medium seemed to be 



