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 Pl. 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. 
