PLATE XVIII 
Tuber-rot from Pennsylvania caused by FusariiUn eumartii, n. sp.: 
Fig. i, 2.—External and sectional view of the same potato tuber. The spots in the 
center of figure 2 are not pertinent. 
Fig. 3, 4.—Sectional views of other potato tubers. 
5 ’ A cross section of a potato tuber showing how the fungus frequently follows 
the tissue adjacent to the bundle ring. 
