1917] CURRENT LITERATURE 17t 
cross-infection experiments with R. Solani, and (6) a description of the growth 
of this fungus in various media. 
The numerous cross-infection experiments carried out with Rhizoctonia 
Solani are of special interest. Strains of the fungus from some 30 species 
plants were used to infect carnations in several stages of growth, from the 
cutting to the mature plant, both under glass and in the field. A number of 
other plants also were infected with various strains of Rhizoctonia. The 
results of all these cross-infection experiments can best be stated in the author’s 
own words: “From these inoculation experiments with a large number of 
different types of plants, we must conclude that all the strains studied, which 
were obtained from a wide age of hosts ee dives gecprsplucst origin, can 
attack the 
No marked specialization was noted in any of the strains. Thus, all the 
strains studied can be included under one form, Rhizoctonia Solani Kiihn. The 
inoculation experiments show further that the virulence of R. Solani is very 
variable, as is also the degree of resistance of the various host plants, both 
depending upon a number of factors.” A study of the growth characteristics 
confirmed this general conclusion. Strains isolated from the same host 
species showed differences as great as those between strains isolated from 
different species. 
Matz? has described a form of Rhizoctonia occurring on the leaves and 
stems of Ficus Carica at Gainesville, Florida. This form is regarded by him 
as a distinct species, R. microsclerotia Matz. Aside from its foliicolous habit, 
ae te oe ee ee 
also capable of infecting fig leaves, without prod however 
single ya fe Seat Bera eee rie while 
-HASSELBRING. 
eo 
R. Soi pee ee 
o™, + ee ee : 3 ~— 66 oe ee L eae 
- ae : 1 i? 5 fee twtise Pee 
th 
ty 
reported 
rig Say lpn romng arrnt oy rgen bulge seen Ld in 
cited. The most complete of these earlier lists is that of TiscHLEeR (Pro-_ 
gressus Rei Botanicae 64-284. 1915). IsHrKawa’ has compiled the most 
5:1 aes 
ever published, and in in each case has cited the authority. Besides, 
