84 
the dry, dusty streets of the city this was true. Though the fungus 
was found in June and early July it did not become so destructive : 
until the dry weather of the latter part of July and August. 
A few specimens of a Cysfopus probably belonging to this 
species was found on Artemisia biennts, usually associated with Per- 
onospora leptosperma, DeB. It was not very injurious on this plant 
however, and never occurred in any quantity. 
The rainfall for the summer months of the years 1890 and 
1891 was as follows: 
1890. in. 1891. in. 
June - - oy. Gb. June i oe - 4. 09 
July = ~ - -1. 64 july - = - - 2,01 
Bogue = =. SOF August - _ 
During the two years preceding 1890 the amount of rainfall 
was much less, being but 5.53 in. for the whole three months in 
1888, and 5.03 in. in 1889. During the past summef there 
were several heavy rains in June, and they were distributed in 
such a way as to keep up a tolerably luxuriant vegetation 
throughout themonth. The mildews and white rusts were plen- 
tiful at this time, but apparently did but little damage. The 
greatest amount of injury was done during the dry weather of 
July and August. The fungi had then a good hold on the host. 
plants, many of which were not able to withstand both dry 
weather and fungous injuries. 
On the whole the observations of the season have shown 4 
greater abundance of these fungi here than one would naturally 
expect to findin so dry aclimate. The number of species, while 
not large, is surprising, and the abundance of each species is VetY 
much more so. Another noticeable feature is the injuriousness of 
such a great majority of the species found. 
Agricultural College, S. D. TuHos. A. WILLIAMS. 
Parasitic Fungi as Related to Variegated Plants.” 
By Byron D, Hatsrep. 
During the past two years a large number of variegated 
plants have been examined with reference to the presence ° 
parasitic fungi. Attention was first called to the subject by * 
. ‘ : : ves 
study of the foliage of a variegated ash, which had its leav® 
* Abstract of paper before Torrey Botanical Club, February 9th, 1892. 
