234 



IOWA ACADEMY OF SCIENCE Vol. XXVI, 1911) 



480,000 spores on this single leaf. I did not try to find all of the 

 infected leaves on any single barberry, but on some I counted as 

 many as ten infected leaves, which would make 4,800,000 spores per 

 plant. If we now multiply this by 100 it would give us 480.000.000 

 jecial spores for this little area, enough to cause a rust epidemic 

 in the region. 



Wild Barberries in Other Localities. — During the summer of 1919 

 the writer observed wild barberries at the following points in Iowa : 





O O O Ba^rBerr/es^ 

 /remaiyec/J 



Larjen 



House 



FOREST CITY 



Qarhemes 

 (pa shoots) 



Fig. 81. — Barberry removed, but an abundance of young shoots. 



Mcintosh woods shore of Clear Lake, Doughty woods shore of 

 Iowa Lake, a mile southwest of Monmouth in Jackson county, Van 

 Wert where it was collected by Mrs. E. E. Castor and a mile from 

 Mt. Carmel on the farm of Albert Wiederin, section 30, Sheridan 

 township, in northern Carroll county where it was found by the 

 writer and Mr. J. V. Coupe. The circumstances under which these 

 wild barberries occur are so different that it may not be amiss to 

 say a few words about it. 



The Carroll county specimens were found on the banks of the 

 highway and growing with such plants as Solidago Missouricnsis, S. 

 rigida, Aster hc^'is and Knhnia eupatorioidcs. It is on the divide 



