TAKEWO HEMMI 295 
Table IX. 
Valsa leucostoma 
The Causal Fungus 
Number of perithecia 
in a stroma 
3—10 (to 20 after some authors) 
Commonly 15—40 
Asci 
48 — 56x6—8 u. 
{35 — 45X7— 8 fx after Stevens, \ 
V40 — 62x5 — 8 ix after Aderhold./ 
60 — y6x8.8 — 16 fx 
Ascospores 
10—18x2.5—3.5 u, 
/y. 3 — 14x2.3 — 2.6 tx (mostly 10— 12X2. 5\ 
I fx) after Aderhold, 1 
\y — 12x2-2.5 y. after Stevens. / 
IO — 28X3.2 — 7.2 [X 
/Commonly 18 — 22x40 — v 
U 8 ix 1 
Pycnospores 
4 — 5 x 1 (J. 
/3.5— y. 3x0.87 — 2.3 |x (Commonly \ 
( 4.5 — 6x 1 — 1.5 (x) after Adf.rhold, 1 
^5.5 — 7.5x1.0—1.5 fx after McAlpine. ' 
3-5 - 15-75 X 1.0-2.63 {i 
/Commonly 7.0—8.75 x \ 
\i-4-i/5!J- / 
Valsa Prunastri (Fexs.) Fr., reported as the cause of a serious disease of 
apple, plum and other drupaceous trees in England, belongs to the subgenus 
Eutypella, which was raised by Saccardo to an independent genus, and is too 
distinct from our fungus for the purpose of comparison. 
Valsa ambiens (Peks.) Fr., which is described as widely distributed on 
various kinds of trees and which belongs systematically to the same subgenus, 
seems to be nearly allied to our causal fungus. But one can still find various 
differences, as seen in the following table, especially in the measurement of 
the pycnospores and the structure of the stromata. 
Table X. 
Valsa ambiens 
The Causal Fungus 
Size of stromata 
1.5—3.0 mm. in diameter at base. 
3 — 5 mm. in breadth, 
2 — 4 mm. in height, 
and 1 — 1.5 mm. 111 depth. 
Number of perithecia 
in a stroma 
4 — 20 
Commonly 15 — 40 
Construction of 
stromata 
Lower half of the stroma consists mostly 
of the host-tissue. 
The greater part of the stroma 
consists of the mycelial tissue, 
and the host-cells are scattered 
in it. 
Asci 
oblong or clavate, 
40 — 88x8 — 160., 4—8 spored. 
Cylindrical or rarely clavate, 
00' — 96x8.8— 16 [j., always 8 
spored. 
Ascospores 
/ 16 — 24x3 — 6 u. in 8 spored asci.\ 
( 24 — 30X 5 — 8 |j. in 4 spored asci j 
Vafter Winter and Schroeter. / 
/16— 18 X 3— 4 tj. in 8 spored asci, \ 
1 20 — 2 0 X5 — 6 [X in 4 spored asci j 
Vafter Saccardo. ' 
10 — 28x3.2 — 7.2 (j. 
(Commonly 18 — 22x4.0 — 4. Su.) 
Pycnospores 
5 — 7 X 1 [x 
3-5- 15.75 X 1.0-2.63 [x 
(Most commonly 7.0 — 8.75 x 
1.4-1-75 
