Feb. 15, 1925 
331 
Inoculation of Coniferous Stems 
Table I .—Source and identity of the tested fungi —Continued 
Name 
Line 
No. 
1 Source 
i Host 
Locality 
Contributed by— 
Gibber ella saubinetii 
916 
D. Atanasoff 
(Mont.) Sacc. 
933 
I Ipomoea batatas _ _ 
Indiana__ 
L. L. Harter. 
Mucor racemosus Fres... 
927 
I 
Do. 
Nectria ipomoeae Hals.... 
931 
Ipomoea batatas _ 
New J ersev 
Do. 
Pestalozzia funerea? Desm. 
968 
Pinus palustris leaves _ 
Florida _ 
M. W. Taylor and 
G. G. Hedgcock. 
Phomopsis juniperovora 
860 
Juniperus virginiana _ 
East Tawas, Mich.. 
G. G. Hahn. 
Hahn. 
864 
_do____ 
_do. 
Do. 
865 
_do . . _ _ 
do 
Do. 
867 
_ do___ _ 
_do _ 
Do. 
Unidentified Phycomy- 
543 
Ol ea europaea _ _ 
California 
C. Hartley. 
cete. 
Pythiacystis ciirophthora 
943 
J. T. Barrett. 
Sm. and Sm. 
Pythium, artotrogus( Mont.) 
778 
Pinus resinosa seedlings... 
Michigan_ 
G. G. Hahn. 
De Bary. 
821 
Pinus banksiana seedlings. 
District of Columbia 
Do. 
833 
_do _ _ 
_do _ . 
Do. 
Pythium debaryanum 
131 
Solanum tuberosum _ 
California_ 
Mrs. C. R. Tillotson. 
Hesse. 
258 
Pinus ponderosa seedling.. 
Kansas__ 
T. C. Merrill. 
295 
Reisolation of No. 131 from 
H. A. Edson. 
Beta vulgaris seeding. 
296 
Beta vulgaris seedling. 
Wisconsin.... / 
Do. 
338 
Reisolation of No. 295 from 
R. G. Pierce. 
Pinus ponderosa seedling. 
408 
Reisolation of Nb. 338 from 
Do. 
Pinus banksiana. 
529 
Trigonella foenum graceum 
Sonoma County, 
C. Hartley. 
seedling. 
Calif. 
550 
Picea sitchensis seedling_ 
Berkeley, Calif_ 
Do. 
743 
Pinus resinosa seedling_ 
Michigan_ 
G. G. Hahn. 
767 
_do____ 
..do.. 
Do. 
810 
Solanum tuberosum _ 
California_ 
L. A. Hawkins. 
Phytophthora cactorum 
901 
L. O. Kunkel. 
(C. & L.) Sebrath. 
Phytophthora fagi Hart . 
967 
Joha. Westerdijk. 
Phytophthora sp... 
358 
Pinus resinosa seedling_ 
Cass Lake, Minn... 1 
R. G. Pierce. 
372 
_do____ 
_do... . 
Do. 
843 
Reisolation of No. 372 from 
G. G. Hahn. 
Pinus ponderosa seedling. 
Rheosporangium aphani- 
351 
Beta vulgaris seedling_ 
Wisconsin_ 
H. A. Edson. 
dermatus Edson. 
430 
Reisolation of No. 351 from 
j 
R. G. Pierce. 
Pinus banksiana seed- 
! 
ling. 
| 
Rhizoctonia potomacensis 
881 
Lycopersicon esculentum ... 
District of Columbia; 
H. A. Edson. 
Wr. 
j 
Thielavia basicola (B. & 
428 
Nicotinia ... 
Wisconsin. . . i 
J. Johnson. 
B.) Zopf. 
| 
Verticillium sp... 
e 399 
Litchi chinensis 
California . 
R. G. Pierce. 
«Identified by C. D. Sherbakoff. 
Oogonia approximately 20 to 38 m. 
Oospores approximately 14 to 31 m. 
Oogonia brownish, smooth, practically 
spherical. Oospores smooth, spherical, 
lying free in oogonia. Walls about 2.6 y 
thick. Oogonia apparently grow up 
through laterial or basal antheridia. 
Further taxonomic study is necessary. 
METHOD OF EVALUATING RESULTS 
The next to the last column in Tables 
II, IV, V, and VI shows the average 
per cent of the seedlings killed (direct 
average of the preceding three or 
four columns). It is obvious that this 
average does not absolutely represent 
the amount of damage which each 
fungus can cause, because it is based 
upon a direct comparison of the differ¬ 
ent fungi, just as if they had all been 
tested in the same experiment. As a 
matter of fact, some of the fungi were 
tested in one experiment, and others 
in different experiments in which con¬ 
ditions may have been more or less 
favorable to damping-off. Three 
“standard” fungi—one line of Pythium 
debaryanum , one of Corticium vagum , 
and one of Fusarium moniliforme — 
were used in all experiments for the 
sake of checking the homogeneity of 
the results. The fact that these fungi 
were decidedly more virulent in some 
