104 
N. C. AGRICULTUKAL EXPERIMENT STATION. 
such hypha-. They are at times also produced in abundance upon the 
germ tubes formed by the ascospore, Fig. 15. In some cases several 
are formed close together, so that many gonidia are produced together, 
forming a large mass and completely hiding the stalks that bear them. 
Fig. 16. Sclerotia taken from one infected plant, showing variation in size. 
Sclerotia .—Upon suitable media in the laboratory and upon plants 
in the field the purplish black resting bodies, the sclerotia, are formed. 
These vary much in shape, some of the smaller ones being almost 
Fig. 17.—Section of a sclerotium showing parenchyma-like rind.and modified mycelium 
of the interior. 
spherical and some of the larger ones long, irregularly cylindrical or 
flat. In size there is also much variation, the smallest ones being no 
larger than a pin head, while the larger ones are larger than a grain 
