116 
N. C. AGRICULTURAL EXPERIMENT STATION. 
TABLE IX.—SHOWING SCLEROTIA PRODUCTI ON IN CULTURES. 
Date 
Jan. 
28, ’07 
Jan. 
30, ’07 
Feb. 
2, ’07 
Feb. 
4, ’07 
Feb. 
6, ’07 
Feb. 
8, ’07 
Feb. 
11, ’07 
Feb. 
14, ’07 
Feb. 
17, ’07 
Total 
Sclerotia taken from Culture, A_ 
52 
39 
105 
10 
39 
75 
67 
65 
71 
523 
Sclerotia taken from Culture, B___ _ 
52 
89 
39 
75 
10 
41 
29 
26 
36 
397 
Total-__..._ 
104 
128 
144 
. 85 
49 
116 
96 
91 
107 
920 
The formation of sclerotia seems dependent upon the attainment of 
a certain mycelial density. Thus upon a rich medium, as corn meal, 
continued branching accompanied by radial enlargement of the colony 
Fig. 21.—Sclerotia produced in culture upon corn meal wetted with apple broth, showing con¬ 
centric rings of sclerotia around the central point of inoculation. 
soon leads to mycelial crowding. A quite regular ring or zone of 
sclerotia results, Fig. 21. Again radial expansion begins and after 
a certain interval another ring of sclerotia is produced. This alter¬ 
nation is repeated indefinitely. 
When several colonies are so located that they meet mycelial crowd- 
ing must occur at the points of contact. Here, too, sclerotia develop in 
