290 
tures for several days in transferring them 
to the laboratory, the question arose con- 
cerning the possible effects of such tem- 
peratures on spore germination. Mycelial 
mats of Endoconidiophora fagacearum 
were grown in the laboratory in the fol- 
lowing manner. Oak wood pieces meas- 
of germinating pad cells producing abundant endoconidia, 125. B. Small germinating pad cell 
producing endoconidia after 12 hours at 22 degrees C., X650. C. Four germ tubes extending 
from a single pad cell, X800. D. Germinating pad cell with abundant sporulation after 48 — 
%* 650. E. Secondary sporulation by germinating conidia after 48 hours _ 
hours at 28 degrees C., 
at 25 degrees C., X800. 
ILtinois NATURAL History SuRVEY BULLETIN 
Vol. 26, Art. 3 
uring about 3 inches by 0.5 inch were 
placed on end in 250-ml. Erlenmeyer 
flasks which contained a wheat bran broth 
(8 gm. of wheat bran in 75 ml. of water). 
The bran broth was steam sterilized, and, 
when it was cool, a few drops of a spore 
suspension of the fungus were placed in 
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