804 
Journal of Agricultural Research 
Vol. XXXI, No.» 
and in less than an hour the spores began to separate. No other 
method of spore liberation was noted. 
Spore germination was studied, but only one method was found to 
occur. In from six hours to two or three days, germ tubes developed * 
and branched and rebranched, and soon formed a network of hyphae. 
The end cells of a spore germinated most frequently, but any cell 
of the five to nine present was capable of germination (fig. 1), and 
as many as three were seen to germinate in a single spore. Hon 
(6) claims that only the end cells of the ascospore germinate, but the 
writer repeatedly noted that the other cells produced germ tubes. 
Mangin ( 12 ) claims that on germination the spores form a promy¬ 
celium which bears sickle-shaped sporidia, and that these give rise 
to germ tubes which enter the host plants through the root hairs. 
