311 



The Uredinales of Delaware. 



H. S. Jackson — Purdue University. 



The following account of the Uredinales of Delaware is the result 

 of a study of the rust flora of that State begun in 1906, during the tir_:e 

 when the writer was connected with the Delaware College and Experi- 

 ment Station. A preliminary manuscript was prepared at that time and 

 has since been revised and amplified at variovis tinies and finally rewrit- 

 ten in the present form in the winter of 1916-1917. A few changes and 

 additions have since been made to bring the notes up to date. 



The records include all the material in the Herbarium of the Dela- 

 ware College Agricultural Experiment Station, together with the collec- 

 tions made by the writer during a period of three years, and most of the 

 collections made by the late Mr. A. Commons of Wilmington, Delaware. 



Mr. Commons made a very extensive collection of the Phanerogams 

 and Fungi of the State, largely during the period from 1885 to 1895. 

 Most of the fungi were determined by Mr. J. B. Ellis and duplicates of 

 the specimens are now in the herbarium of the New York Botanical 

 Garden. A manuscript list of the fungi was prepared by Mr. Commons, 

 but never published. 



The writer enjoyed the privilege of a conference with Mr. Coimv.ons 

 in 1907 £:nd was permitted to make a record of the rusts from his manu- 

 script list. His collection was not available for consultation at the time, 

 having been stored in boxes in a garret in Wilmington. Duplicate:; of 

 most of the specimens, however, have been found and examined in the 

 Ellis herbarium at the New York Botanical Garden. Only those speci- 

 mens which the writer has seen are included in the present account. 



A total of 129 species are recorded from the State, including the 

 unconnected species of Aecidium and one uncertain Uredo. These r.re 

 recorded on 232 different hosts. A total of about 450 collections are 

 included, the greater number of which were made by the writer. 



In recording the collections, the nearest poctoffice is given, together 



1 Contribution from the Botanical Department ol" the Purdue University Agricul- 

 tural Experiment Station. 



