622 
Journal of Agricultural Research 
Vol. XXXI, No. 7 
S. ricinij which produces a darker-colored decay than that of the 
other species, there is not enough constant difference in texture and 
color of the lesions to justify any attempt to differentiate between 
the different decays produced by the different species. 
TEMPERATURE STUDIES 
GROWTH ON CULTURE MEDIA 
In cultural studies of Sclerotinia libertiana, 8. minor , and S. inter - 
media } the greatest differences in habit of growth have been found 
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Fig. 1.—Graph showing average radial growth in millimeters of 14 strains of S. libertiana , 4 strains of S. 
minor, and 1 strain of S. intermedia on potato-dextrose agar at 0° C. during 10-day period 
when low temperatures are involved. The mycelium of each species 
has been found to remain viable after exposure to —5° C., and to 
make growth on potato-dextrose agar below 0°, but the rates of 
growth are widely different. This is especially noticeable with S. 
intermedia , which, as a rule, grows about twice as fast as either of 
the other species. Figure 1 shows the results of an experiment 
