News and Notes 



329 



ence, and believes that the trees are gradually killed by this 

 fungus, which causes a special decay of the wood, transforming it 

 into a white, fibrous, very fragile mass. 



Professor Bruce Fink, of Miami University, Oxford, Ohio, 

 desires to see fresh material in abundance of species of the 

 Collemaceae collected in various parts of North America. This 

 group of lichens is greatly in need of careful modern taxonomic 

 treatment and Professor Fink will devote much of his time 

 to it during the next two years. 



Bulletin 247 of the Bureau of Plant Industry at Washington 

 is devoted to the discussion of a knot of citrus trees caused by 

 Sphaeropsis tumefaciens, by Florence Hedges and L. S. Tenny. 

 This disease, which has been known on lime- and orange-trees in 

 Jamaica for several years past, has recently been reported from 

 Florida. Careful pruning is recommended and great care is 

 advised in order to prevent the spread in this country of a new 

 citrus fruit disease. 



In the Gardener's Chronicle for 191 1, G. Webb describes a 

 successful treatment of hollyhocks against attacks of the rust 

 (Puccinia malvacearum) by the application of a powder which 

 consists of I bu. of slaked lime, i bu. of soot, 4 lbs. of flowers of 

 sulphur, and 2 oz. of finely powdered sulphate of copper. This 

 mixture should be passed through a fine sieve and the plants 

 dusted with the powder three or four times during the growing 

 season, in the morning while the dew is still upon them. 



The first number of a new journal bearing the name My- 

 cologisches Centralblatt and devoted to general mycology ap- 

 peared in February, 1912, edited by Dr. C. Wehmer in Hannover, 

 and published by Gustav Fischer in Jena. The associate editors 

 are: Blackman, Blakeslee (U. S.), Elfving, Erikson, Fischer, 

 Giesenhagen, Klebahn, Lagerheim, Maire, Meyer, Molisch, 

 Transchel, Tubeuf, Went, Zellner, and others. These names are 

 sufficient to indicate the broad scope of the new journal. 



