ENDOTHIA PARASITICA AND RELATED SPECIES. 7 



that at one time the specimen was apparently attached to a sheet 

 by a gummed paper strip. This seems to have been the way in which 

 Schweinitz originally mounted his specimens, but later, apparently, 

 he changed to the plan of putting them in paper packets and removed 

 those which had been attached to sheets. It is clear from an examina- 

 tion of the specimens still found in some of the original packets 

 that two or more different hosts were sometimes included. In some 

 cases as many as four or five different collections appear to have been 

 placed in the same packet and each new locality added on the out- 

 side. This method of keeping specimens makes it rather difficult in 

 some cases to determine which belongs to the first collection. In the 

 case of Sphaeria gyrosa but two localities are indicated on the packet, 

 Salem and New England. (See PI. VI, fig. 2.) 



The difficulties in determining the true type specimen of any 

 species would have been sufficiently great if the collection had been 

 preserved as it was left by Schweinitz. The matter is, however, 

 further complicated by the later handling and rearrangement of the 

 collection. Some time after Schweinitz's death (the exact date the 

 writers have been unable to determine) his collection of fungi was 

 more or less completely rearranged and mounted. The greater part 

 of this work was evidently done by Dr. Ezra Michener. Dr. Mich- 

 ener was a lifelong resident of Chester County, Pa. He early be- 

 came interested in botany, and in 1840 was elected a correspondent 

 of the Philadelphia Academy of Natural Science. He paid special 

 attention to the collection and study of fungi and corresponded and 

 exchanged with various mycologists, especially Curtis and Ravenel. 

 He left a large collection of fungi, which the writers have recently 

 had the privilege of examining. Among his specimens are found 

 many labeled "Ex. Herb. Schw.", which are undoubtedly part of 

 Schweinitz's original collections at the Philadelphia Academy. 

 These specimens, as well as all of Michener 's fungi, are mounted in 

 exactly the same manner as the mounted portion of Schweinitz's col- 

 lection at the Philadelphia Academy. The mounting paper, the 

 specimen slips, the arrangement, manner of attachment, and the 

 handwriting on the labels are identical, as will be readily perceived 

 by comparing the illustrations from photographs of sheets from 

 both herbaria. It is, therefore, clear that the mounted collection 

 of Schweinitz's herbarium was prepared by Dr. Michener. He evi- 

 dently took from Schweinitz's original paper packets what appeared 

 to him to be the best or most typical specimen of the species in the 

 packet and attached it with glue to a square slip of paper, as shown 

 in Plate III. Where there was but little material in the original 

 packet it was all mounted in this manner. In case there were several 

 pieces in the original packet he used his own discretion in making 

 the selection of the part to be mounted and the part to be left. 



