1913] MATHENY—BROWN-ROT FUNGUS 423 
conidia a little sooner than those of S. cinerea, but in other respects 
their resemblance is very close. 
On pears, 100 experiments were tried. “With the S. Sructigena 
inoculations the results were uniformly the same as on the quince 
and apple. The growth was much slower than that of the local 
Sclerotinia on similar fruit, but the usual large, yellowish conidial 
tufts were produced (fig. 2). 
The European S. fructigena and the local Sclerotinia were grown 
many times on the same pear (figs. 3 and 4), and the results 
were no different from those obtained when they were grown 
separately. 
BEHAVIOR IN PURE CULTURE.—Pure cultures of the European 
Sclerotinia fructigena and of the local brown-rot fungus have been 
grown side by side during the past year (fig. 5). Hundreds of 
cultures of each have been maintained on various media: plum agar, 
bread Agar, beet decoction, apple gelatin, etc. It was thought that 
should these fungi be identical, a similarity in cultural growth 
might appear in some of these media. No evidence of any such 
similarity has so far been observed. Cultural characteristics of 
each are as distinctly different today as they were one year ago 
when this experiment was started. 
Comparison of the conidia of S. fructigena, S. cinerea, and 
local Sclerotinia 
In the accompanying table are arranged the comparative sizes 
of the conidia of S. fructigena and S. cinerea as they have been given 
by different writers. 





ConmDIA 
AUTHOR : : 
” S. fructigena S. cinerea 
Saccardo (A) Se; 25X10-12 | 15-17 X10-12 
Lindau (i6)0 os 20-24 X 12-14 | 12-13Xg-10 
WOH ee 20.9 X12.1to| 12.1 X 8.8 to 
24.5 X13-2 53% 9.9 
Ot eR ep tee dead 18-24X 10-12 | 15-18 X 10-12 
Aderhold and Ruhland| 25X13 3.8 X 9-9 



