180 ARTHUR-BISBY— TRANSLATION OF SCHWEINITZ'S 



131 are North American, 60 without specimens, making a total of 

 327 packets, of which 193 are empty. 



So far as the North American material in the portfolios is con- 

 cerned, it is only the surplus after a suitable part had been removed 

 for mounting. The Schweinitz collections representing his work 

 on the North American Fungi, were mounted by Dr. Ezra Michener 

 mostly during the years 1856 and 1857. As pointed out by Shear & 

 Stevens {Mycologia, 9:337. 1917) the packages of fungi and the 

 mounting material were sent by the Academy of Natural Sciences 

 of Philadelphia to Dr. Michener, the work being done at his home in 

 New Garden, Pa. Even at that time some of the packets were empty, 

 as in a letter to Rev. M. A. Curtis Dr. Michener says : " I have been 

 grieved to find a number of the envelopes either missing or empty." 

 They were doubtless essentially in the same condition when they 

 came into the possession of the Academy some twenty years before. 

 From a letter written to Dr. John Torrey by Schweinitz shortly 

 after his return from Europe in 1819 we learn that he had taken 

 a full set of specimens illustating his new species together with a 

 list of his American fungi abroad with him and left them with Dr. 

 Schwagerichen at Leipzig. This was the North Carolina list printed 

 not long afterward at Leipzig under the editorship of Dr. Schwager- 

 ichen. It is not known whether or not these specimens are yet in 

 existence. Taking out this set may have nearly or quite exhausted 

 his supply in some instances. Specimens were also sent to no less 

 than fourteen individuals and herbaria according to Shear & 

 Stevens,® among them being his correspondents at Upsala, Kew, 

 Edinburgh, Paris, Berlin, Vienna and elsewhere, which doubtless 

 drew heavily upon his material at times. 



So far as concerns the part of the collections examined by the 

 writers it seems that Schweinitz was usually in the habit of making 

 but a single collection to represent a species and when he observed 

 the same species in another locality he merely added the new local- 

 ity on the outside of the packet. In a few cases he preserved col- 

 lections, made by himself or sent to him by others, illustrating dif- 

 ferent hosts, as of 2826 Cceoma (Uredo) Solidag'mis. Occasion- 

 ally he appears to have replenished an exhausted packet by a later 



^Mycologia, 9: 333, 1917. 



