NOTES AND BRIEF ARTICLES 



[Unsigned notes are by the editor'] 



Readers of Mycologia are invited to contribute to this department personal 

 news items and notes or brief articles of interest to mycologists in general. 

 Manuscript should be submitted before the middle of the month preceding the 

 month in which this publication is issued. 



A new method of isolating single spores in Petri dishes for 

 transfer is described by Carl D. LaRue in the Botanical Gazette 

 for October, 1920. 



Volume 7, parts 4 and 5, of North American Flora, by J. C. 

 Arthur appeared at the close of 1920. They include descriptions 

 of 201 species of Dicaeoma, of the Aecidiaceae. This important 

 genus of plant rusts comprises, according to Dr. Arthur, a total 

 of 269 species. 



The dry-rot of incense cedar is discussed by J. S. Boyce in Bul- 

 letin 871 of the U. S. Department of Agriculture. The attacks 

 of Polyporns amarns are very severe, owing to forest fires and 

 various mechanical injuries. Trees with sporophores or serious 

 wounds should be promptly cut. The rotation for incense cedar, 

 according to the author, must not exceed 165 years in the inter- 

 mediate and 210 years in the optimum range. 



In his excellent paper on Crown-gall of Alfalfa, published in 

 the Botanical Gazette for July, 1920, Mr. O. T. Wilson suggests 

 that, although Magnus was right in removing the causative para- 

 site from the genus Cladochytrium, it is doubtful whether he was 

 justified in placing it in Urophlyctis. The author concludes with 

 some interesting remarks about the Chytridiaceae in general and 

 their relationship to the Myxomycetes. 



In a short paper on Porto Rican fungi in the Botanical Gazette 



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