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Arthur: Cultures of Uredineae% IfcJJ 



Three weeks of August, 1913, were spent in company with Mr. 

 H. C. Travelbee, in northern Michigan in the vicinity of Leland. 

 Here very abundant field confirmation was obtained of the cor- 

 rectness of the 1913 spring culture work in associating Puccinia 

 vulpinoidis with aecia on Solidago, and material was secured for 

 repeating the work. 



Two days were profitably given in November, 19 13, accom- 

 panied by Dr. F. D. Fromme, to an exploration of the Kankakee 

 marshes in northern Indiana, and as much time in December fol- 

 lowing, accompanied by Mr: C. A. Ludwig, to a reconnoissance 

 about French Lick in southern Indiana. 



During February and the early part of March, 1914, an ex- 

 tended trip by Dr. Fromme and the writer was made through the 

 Southwest. Field work began at Denison, on the northern border 

 of Texas. At Denton the localities made interesting to uredini- 

 ologists by the extended field work of Mr. W. H. Long were 

 visited. Stops on the way southward to Austin, and a divergence 

 to Houston and Galveston, gave interesting results. Observations 

 in the arid region were made principally at San Antonio and El 

 Paso, Texas, the region about the Agricultural College, N. Mex., 

 and at Douglas and Tucson, Ariz. At Tucson through the 

 kindness and material assistance of Dr. D. T. MacDougal and 

 his corps of investigators at the Desert Botanical Laboratory, the 

 rust flora of the vicinity was examined, and a very important 

 culture on Brodiaea was carried to completion. 



The dominant ideas actuating the above mentioned geograph- 

 ical explorations are not so much those of the ordinary collector, 

 to find new species, but rather those of the student, to secure addi- 

 tional knowledge of species already named but imperfectly known, 

 and to gather facts bearing upon relationships. 



To indicate the extent of the labor involved in securing the 

 results recorded in this paper the following statistics are given. 

 During the three seasons covered by this report, 380 collections 

 with resting spores, and 68 with active spores were available, but 

 scarcely one third of those with resting spores could be made to 

 germinate. To test the germinating condition of the spores over 

 2500 drop cultures were made. Altogether 650 sowings were 

 undertaken upon growing hosts and 84 infections obtained. 



