1900] Eggleston,— Distribution of Arceuthobium pusillum 9 
regions, and Professor Hudson, of Plattsburgh, told me last year that he 
had found it a few miles south of that city, near the shores of Lake 
Champlain. 
Persistent search on the Vermont side of the lake failed to show 
the parasite until this summer. Mr. W. W. Eggleston, of Rutland, 
wrote me in June that he had at last discovered it in a spruce swamp 
near that city. Early in August I visited a large black spruce swamp 
on the south end of the Alburgh peninsula, which divides the northern 
end of Lake Champlain into two arms. Here, at last, my own search 
was rewarded. A considerable per cent of the black spruce trees 
showed abnormal growths or * Hexenbesen"' (witches’ brooms). These 
abnormal branches, in all cases examined, were hosts of the Arceutho- 
bium. No flowering or fruiting specimens of the parasite were observed 
at this time. 
Upon again visiting the swamp the last week of September to 
obtain these, a similar * Hexenbesen" was observed in a medium- 
sized specimen of the tamarack, Larix Americana. Examination of 
this revealed scattering plants of Arceuthobium upon the deformed 
branches. ‘The relative number of these upon the tamarack in pro- 
portion to the size of the ** Hexenbesen " was small, however, probably 
not above one per cent of that found upon similar spruce branches. 
The individual plants of the parasite were of about the size and ap- 
pearance of those found on the spruce. No fruiting plants occurred. 
Time did nét permit of much further search, and no other “ Hexen- 
besen" was observed on tamarack. A photograph of the infested 
tamarack branch was made and is communicated with this article. 
A number of herbarium specimens were taken of the parasite as it 
occurs on spruce, and I shall be glad to send these upon request to 
botanists who are interested in this curious plant. — L. R. JONES, 
Botanical Laboratory, University of Vermont. 
EXPLANATION OF PLATE 14. — Witches’ broom formed on Zarzx Americana as 
a result of the parasitism of Arceuthobium pusillum ; from a photograph. 
FURTHER NOTES UPON THE DISTRIBUTION AND HOST PLANTS OF 
ARCEUTHOBIUM PUSILLUM. — When the 6th edition of Gray's Manual 
was published in 1889, the tiny parasite Arceuthobium pusillum was 
known only from the Adirondacks, Hanover, New Hampshire, and 
Pocono Mountain, Pennsylvania. It now appears, however, to be 
