PAPERS GIVING RUSTS OF NORTH AMERICA, 181 



collection as under 2930 Puccinia Astcris, the packet says " on Aster 

 paniculatus" but contains only material on A. cordifolms. In rare 

 instances he may have placed a second collection of what he believed 

 to be the same form in a packet still having some of the original 

 collection. In most cases, however, the specimens now to be found 

 in the packets appear to represent Schweinitz's first American col- 

 lection of that form. And so it comes around that when a species 

 had first been found in North Carolina and subsequently found in 

 Pennsylvania or elsewhere the material preserved to represent it 

 generally is the North Carolina collection. This is a most fortu- 

 nate situation, as the specimen is thus the type for the earlier of 

 Schweinitz's names, when a change was made in the latter work. 

 The present priority rules require the use of the earliest specific 

 name which in the present connection is a name usually much to be 

 preferred for its brevity and aptness. 



The fungi from North America in the portfolios as presented 

 by Schweinitz to the Philadelphia Academy were labelled in ac- 

 cordance with his work on North Ameriean Fungi, and in large part 

 constituted the basis for that work. Under the genera Cceoma and 

 Puccinia only one North American specimen occurs not mentioned 

 in his published account. It is labelled " Aicidium Dircatatum Ind.," 

 and must have been collected upon his visit to Hope, Indiana, where 

 he went to organize a church. This was in the summer of 1831 

 and doubtless too late to have the name placed in his manuscript. 

 The packet contains three leaves of Dirca, 5 by 7.5 cm., 4 by 8.5 cm., 

 and 5 by 6 cm., the last with part of each end removed, each leaf 

 bearing a single small group of secia. 



Besides the specimens which Schweinitz carried abroad, and 

 those sent to his European correspondents as mentioned above, 

 many were sent to his American correspondents, and especially to 

 his intimate friend, Dr. Torrey. The last were finally given by 

 Torrey either to Curtis and are now in the Herb. Curtis at Harvard 

 University, or to Berkeley, and are now in the Kew Herbarium. 

 After the collection came into possession of the Philadelphia Acad- 

 emy portions of specimens were removed by Curtis for purpose of 

 study during a seventeen-day visit in 1851 (Shear & Stevens, 

 Mycologia, 9:335), part of which were transmitted to Berkeley. 



