1916] 
DUGGAR—RHIZOCTONIA SOLANI 5 
and Delacroix (794) found “Ча toile’’ abundant in the seed 
and propagating-beds, market gardens, ete., near Fontaine- 
bleau. Affected plants were infested with a sterile mycelium, 
and they found a fungus, identified as Botrytis cinerea, fruit- 
ing on the dead material, from which they prepared cultures. 
No infection experiments were made, and they report no at- 
tempt to ascertain if the mycelium in the tissues were really 
that of Botrytis. No additional information is advanced in 
Mangin's (794*) second paper. 
Sorauer (796) refers to the ‘‘ Vermehrungsschimmel" of the 
cutting-benches and of seed-beds as probably belonging to the 
genus Sclerotinia. Reference is made to the spider web-like 
mycelium, lack of sporophores, and the presence of sclerotia. 
It is apparently on account of the sclerotia that he refers the 
fungus to Sclerotinia. He indieates that this organism is the 
chief fungus of the cutting-bench, although Mucor, Botrytis, 
and other organisms may also be found. The description, 
though far from being complete, is applicable to Rhizoctonia. 
Aderhold (797) characterized the fungus and its effects in 
some detail, and there ean be little doubt that he was dealing 
with the disease then recognized as widely distributed. More- 
over, unlike those who preceded him, he obtained the sterile 
fungus in culture, observed the Monilia-like chains of cells, 
and also the formation of sclerotia. It seems remarkable that 
it did not suggest to him Kühn's potato fungus. On the con- 
trary, he agreed with Sorauer in referring the fungus to 
Sclerotinia, without indieating the species. 
In a second paper Sorauer (299) also discusses the fungus 
more completely. He refers to much of the earlier work, in- 
cluding that of Aderhold. Various stages of the fungus are 
figured, that is, the mycelium, the moniliform hyphal cells, and 
the sclerotia, all stages pointing to Rhizoctonia. He also re- 
fers to a characteristic of his fungus, since frequently ob- 
served, doubtless, by all who have studied Rhizoctonia in 
liquid eultures, namely, that of growing up the walls of the 
vessel above the level of the liquid. He also examined the 
affected tissues and was able to follow the mycelium in its 
advance, showing its penetration into the inner bark, like- 
