102 BOTANICAL GAZETTE. 
observations Jead me to answer this question in the aftr 
ut in a limited degree. When a thrifty bunch infests a limb, 
the distal extremity soon ceases to grow and finally dies, unless it 
be a very large limb; but the tree itself seems to be little, if at 
all, affected in its growth. or 
The host on which this parasite is found is peculiar in ue 
localities. During the past eighteen months I have observed 1 
on the trees in this vicinity, as follows: Acer dasycarpum, on 
trees ; A. saccharinum, 5 trees; Ulmus fulva, 1; Quercus pan 
1; Gleditschia triacanthos, 28 ; Ulmus Americana, many thousand. 
In the lower portion of Delaware it is reported as having been 
found only on Nyssa multiflora and Acer rubrum’; in the vicinity 
of Washington as “exclusively on Nyssa multiflora’.” The Ame- 
rican Elm is not a rare tree in either of these localities, while on 
the other hand the Black Gum is a common tree in this vicinity, 
and I have never found a single bunch of mistletoe upon it. 
have observed the Elm and Black Gum interlock branches, the 
former bearing mistletoe and the latter not. In this vicinity tt 
is generally found on trees that grow along streams and on bottom 
lands, and is rarely seen on the uplands. I made the following 
notes from the car windows on a visit to Washington, D. C.,™ 
February, 1883, starting from Mt. Carmel, Ill., and traveling vl 
Louisville, Ky. “Abundant, but only on the American re 
until we came to Winslow, Ind. Here for the first time I 0? 
served it on the Black Gum. From this on I found it on this — 
species as often as on the Elm. In the blue-grass region of Ken- 
tucky I found it common on the Black Walnut and Wild Cherry. 
In West Virginia it was common on the Red Maple, but had dis 
appeared from the walnut and cherry. East of the Blue Ridge | 
I observed it on a Beech.” a 
Prof. John Collett’ gives ihe following list of trees on which 
he has observed it in Vanderburg county, Indiana, and the rela 2 
pe : a 
Gum, 500 ; Red Elm, 420; Water Birch, 20; Black Walnut, 19; 
Honey Locust, 10; Blue Ash, 10; Soft Maple, 10; Hackberty) e 
5; Yellow Willow, 5; Shell-bark Hickory, 2; Spanish Oak, *% : 
White Oak, 1; Wild Cherry, 1. In addition to the above I fin¢ 
1 e , Walnut, Honey Locust and various it 
trees,” in the vicinity of Hanover, Ind. A. H. Curtiss’’ says 
7 . = ; Ve 
__ Bot. Gaz. 6.271. "Flora of Washington and vicinity. %Ind. Geol. Sur 
1875, p. 241. Bot. Gaz. 2.116. "Bot, Gaz. 3, 36. 
