34 BULLETIN 934, U. S. DEPARTMENT OF AGRICULTURE. 
rather more representative of the country as a whole geographically 
than the strains in the larger of Peltier's experiments, though less 
representative as to host sources. The number is too small to justify 
conclusions as to the proportion of Corticium vagum strains which 
can be expected to prove strongly virulent on pine. The data are 
offered merely as a beginning, to which it is hoped experimenters 
with other strains of C. vagum will make additions. 
In addition to the strains used in these two experiments, several 
others which had been lost or for other reasons could not be included 
in both the final experiments had been previously tested on pines in 
earlier experiments. Of these, 6 strains, 1 each from alfalfa, sugar 
beet, Pseudotsuga taxi folia, Pinus banksiana, P. resinosa, and P. 
strobus, gave indications of low virulence on the pines; 3 strains, 1 
each from sugar beet, Pinus sylvestris, and P. ponderosa, gave indi- 
cations of rather high virulence; while another strain from P. ponde- 
rosa indicated an intermediate ability to attack pine. Combining 
these strains with those represented in figure 13, there are data on 27 
original strains, of which 8 are roughly classed as strongly virulent 
on pine seedlings, 14 as weak, and 5 as intermediate. 
Edson and Shapovalov (40) have conducted inoculation experi- 
ments on potato stems with 6 of the Corticium strains which had 
been used on pine, including the 5 strains mentioned by them on page 
218 and their strains R. XV (the writer's strain 192 of fig. 2) on page 
215. Strains 147 and 724, which had proved the most destructive 
in the inoculations on pine, appeared also rather strongly virulent on 
potato. Strain No. 186, originally from potato, which had given no 
definite evidence of parasitism on pine,, also proved unable to cause 
lesions on the potato stems. The remaining 3 strains, all of inter- 
mediate virulence on pine, gave results on potato which were less in- 
dicative of agreement with the order of virulence on pine. The data 
suggest that strains strongly parasitic on potato are likely to be 
strongly parasitic on pine, and vice versa, but the agreement between 
their results and the writer's is not sufficiently complete to establish 
the point. 
FUSARIUM SPP. 
.Fusarium is often found on or in damped-off seedlings (24, 46, 60, 
94, 120, 137, 141, 142). The early inoculation experiments, conducted 
in the main with strains not sufficiently described to allow their iden- 
tification, have been recently summarized (68, p. 537), together with 
descriptions of inoculation experiments on pine seedlings with four 
commonly recognized species of Fusarium. These, though not fol- 
lowed by reisolation, gave rather definite evidence that Fusarium 
moniliforme Sheldon was decidedly parasitic and F. solcmi less 
strongly so. Fusarium ventricosum* Appel and Wollenw. was indi- 
