Sept. 1907] A New Species of Protomyces 189 



In the 35th Rep. of the New York State Botanist, p. 138, is 

 reported the occurrence of Protomyces marcrosporus Ung. on 

 leaves and stems of Ambrosia trifida L., at Albany, with a brief 

 description that corresponds with the fungus on Bidens. Prof. 

 Peck informs me that it was abundant at one station during one 

 season. Through the kindness of Dr. Farlow I have had an op- 

 portunity to examine sections of a gall on Ambrosia artemisiaefolia 

 L. which was sent him from Nantucket, Mass. in August 1905, 

 containing spores similar to those in the Bidens galls. 



Sydow described in Annales Mycologici, i : 237, Entyloma 

 leucanthcmi which v/as distributed by Vestergren {Microm. No. 

 808.) under the name Protomycopsis leucanthemi (Syd.) Magn. 

 but I have been unable to learn of a publication of the characters 

 of the genus. Again through the kindness of Dr. Farlow I have 

 been able to examine sections containing this fungus. The spores 

 are similar to those in Bidens but they appear to occur in the leaf 

 blade without gall formation and no mention is made of such 

 swellings by Sydow. I therefore hesitate to distribute my ma- 

 terial under the name given by Magnus. 



I have found the fungus here considered on no hosts other 

 than Bidens — not even on Coreopsis growing with affected Bi- 

 dens — and for my present purpose the question as to the rela- 

 tion between the Ambrosia and Bidens inhabiting forms may be 

 left open. 



I have made many attempts to observe the germination of 

 the spores, at all seasons of the year, using material kept con- 

 tinuously out of doors but without result. 



Racine, Wisconsin, August 6, 1907. 



CULTURES OF UREDINEAE IN 1906.^ 



BY J. C. ARTHUR. 



The present article forms the seventh of a series of reports^ 

 by the author upon the culture of plant rusts, covering the years 

 from 1899 to the close of 1906. As in previous years the grass 

 and sedge rusts have constituted a large part of the list of species 

 under trial. This is partly due to the economic and scientific 

 interest connected with them, but even more, possibly, to the 

 greater ease with which wintered-over and viable spores may 

 be secured for cultural study. Among the species whose life- 



^ Read before the Botanical Society of America at the New York 

 meeting, December 31, 1906. 



'See Bot. Gaz. ^9:268-276, j5:10-23; Jour. Myc. 5:51-56, /o:8-21, 

 //:50-67 and 12:11-27. 



