CONTROL OP DECAY IN PULP AND PULP WOOD 
73 
Table 16. — Deterioration of ground wood caused by 11 hymenomycetes isolated 
from wood and one from water 
Sample 
No. 
Culture No. 
Organism 
Per 
cent 
mois- 
ture 
Per cent loss in 
after— 
weight 
Physical condition of pulp 
6 mos. 
9 mos. 
12 mos. 
196 
[•TJninoculated 
[61420-1--.... 
Ul420-2 
162520-1 
[62520-2 
18620-1.. 
Ul420-3 
162220-1 3 . 
... ... 
0.5 
197 
(0 
~~"6~Q~ 
198 
(Lentinus lepi- 
\ deus .. 
1 67.3 
1 67.6 
{ 71.7 
1 70.3 
f 70.3 
< 67.2 
I 68.1 
f 66.4 
< 62.8 
I 60.8 
f 62.0 
{ 60.4 
{ 62.5 
f 70.0 
\ 70.6 
I 57.1 
f 62.8 
< 58.9 
[ 60.8 
f 63.7 
\ 63.1 
I 55.8 
f 67.0 
\ 67.8 
I 58.9 
f 67.6 
{ 65.1 
I 61.8 
f 65.6 
\ 63.9 
I 64.6 
66.6 
{ 60.9 
I 62.1 
f 69.3 
\ 63.4 
I 72.5 
157 
21.5 
158 
159 
30.3 
"~40.~2~ 
1 Cinnamon to sayal brown; 
very friable. 
Fomes roseus.. 
(Stereum sang- 
\ uinolentum.. 
(Corticium ga- 
\ lactinum..-. 
(Peniophora ia- 
\ bacina 
Unidentified __ 
do 
130 
10.3 
131 
132 
12.9 
"~13.T 
1 Cinnamon-buff to clay color; 
somewhat brittle. 
139 
1.8 
140 
141 
2.2 
"~2~2.~8~ 
■Cinnamon. 
142 
2.2 
143 
144 
3.3 
"""2"2."§" 
■Cinnamon-buff. 
148 
13.5 
149 
151 
19.5 
""22.1" 
■Cinnamon-buff; very brittle. 
136 
8.7 
137 
138 
13.9 
""18.I" 
■Pinkish buff; very brittle. 
145 
3.2 
Cinnamon-buff to clay color; 
146 
4.2 
B.'B" 
147 
>61420-7 
Ul420-5 
61420-4- . 
do 
do . 
do 
slightly brittle. 
152 
7.9 
150 
153 
12.8 
"~I6.T 
■Cinnamon-buff; very brittle. 
154 
2.0 
155 
156 
2.4 
""2"2."3" 
■Normal. 
160 
2.8 
161 
2.6 
"'i'%1' 
^Cinnamon-buff; slightly brittle. 
162 
14620-4 . . 
do._ 
175 
4.7 
176 
5.0 
""7."6" 
>Clay color; slightly brittle. 
177 
U620-3 
Average 
do 
178 
14.1 
179 
180 
16.6 
""20.I" 
■Cinnamon-buff; very brittle. 
64.7 
10.5 
14.4 
18.0 
1 Contaminated. 
2 Transplants did not grow. Results of this set not included in averages. 
3 Isolated from river water. 
Trichoderma sp. (6520-2), Aspergillus fumigatus, PeniciUium sp. 
(6520-3) , and P. vinophilum dissolve cellulose when planted upon cellu- 
lose agar (McBetn and Scale's formula) and kept at 28° C. In the pulp, 
at about 21° C, however, they produce a loss in weight of only 1.4 
to 3.2 per cent, which is far below what might be expected of cellulose- 
dissolving organisms. Under commercial methods of storage Trich- 
oderma sp. (82219-10) turns pulp bright yellow; PeniciUium pino- 
pTiilum and P. purpurogenum and other species of PeniciUium pro- 
duce red discolorations which vary from light pink to purple-red; 
Spicaria sp., Alternaria sp., and two unidentified cultures (82219-2, 
82219-18) cause brown spots which would appreciably lower the 
quality of paper made from pulp infected by them ; and eight of the 
unidentified molds (3818-1, 81318-1, 82219-5, 82219-9, 10918-7, 
82219-23, and 82219-21) produce gray pulp. 
Since the more pronounced discolorations common to the above 
fungi did not occur in the jar tests, one can only conclude that some 
factor was unfavorable to their best development in the series of 
