434 BOTANICAL GAZETTE [ DECEMBER 
I am indebted to Mr. Albert F. Woods for much assistance in the 
later stages of the work, and to Mr. Theo. Holm for a number 
of the anatomical drawings, and aid in finishing my own figures. 
DISTRIBUTION OF THE HOST AND PARASITE. 
Pinus Virginiana is a native of the eastern United States, 
being found in considerable abundance from central Pennsylvania 
‘southward to middle Georgia and westward to western Kentucky 
and Tennessee. Under favorable conditions the tree attains a 
height of 20 to 30™, with a trunk 25 to 75™ in diameter. In 
the District of Columbia and country immediately adjacent this 
is the most common species of pine, many of the old fields and 
waste grounds being overgrown with trees ranging in height 
from 3 to 5™. It is on these that the Coleosporium is usually 
found, the parasite as a rule being especially prevalent on trees 
2 to 4™ high. 
The fungus has been found in mote or less abundance in the 
District of Columbia, Maryland, and Virginia, and has also been 
collected by the writer on Lookout Mountain, in Tennessee, and 
at Asheville, N.C. No attempt has been made to collect it 
elsewhere, but there is no reason to doubt its occurrence wher- 
ever the host is found. Although careful examinations have 
been made the Coleosporium has never been seen upon any other 
host but the one under consideration. 
APPEARANCE OF AFFECTED TREES. 
During the winter the leaves of Pinus, in common with other 
eee a 
evergreen plants, change color, the dark green fading out to 
: : 6 
reddish yellow as the season advances. As spring approache 
the foliage again resumes its normal color, growing brighter . 
the conditions for growth become more favorable. In the ear é 
i a 
part of May, when the trees have fully recovered their norm 
: ing of 
3For an account of the physiological changes involved in the winter coloring 
evergreen leaves, together with a review of the literature on the subject, S€ 
ERLANDT: Untersuchungen iiber die Winterfarbung ausdauernder Blatter, 
ber. d. Acad. d. Wiss. zu Wien 92: —. Ap. 1876 
e G. HaB 
Sitzungs 
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