CONTROL OF DECAY IN PULP AND PULP WOOD 61 
Pulp is not discolored by this fungus, except that the yellow chlamy- 
dospores are formed on the surface. It causes little damage. Iso- 
lated from ground wood (61520-1). Observed once. 
6. One culture forming a loose silky layer over the surface of 
medium and a very fluffy white margin. In old cultures the mycel- 
ium sometimes becomes cinnamon colored. Glistening droplets 
appear on the mycelium. White to cinnamon buff, warty hymenial 
patches are frequently formed on plate cultures. This fungus turns 
the pulp pinkish buff (dry) to cinnamon buff (wet). It causes con- 
siderable loss in weight and makes the pulp very brittle. Isolated 
from ground wood (61020-1). A similar culture was isolated from 
spruce pulp wood. Observed once on pulp. 
7. One culture with loose, fluffy mycelium, white, later becoming 
tinged cinnamon buff; no clamps; no chlamydospores. Macroscop- 
ically this culture has all the characteristics of a hymenomycete. 
Infected areas become pinkish buff (dry) to clay color (wet), with 
scattered depressed white spots. It causes considerable loss in 
weight in the pulp. Isolated from white water (62220-1) . Observed 
once. 
8. One culture with loose, fluffy, white mycelium, later becoming 
cinnamon buff. Some hyphse are very large, with whorls of large 
clamps (PI. XVI, fig. 3) ; no chlamydospores. Bleaches the agar. 7 
Newly infected areas are pinkish buff (wet), later becoming deep 
mikado brown. Isolated from fresh river water. Observed once. 
9. Two cultures of a loose, fluffy, white fungus, which on Petri-dish 
cultures produces rather compact zones of basidia bearing basidio- 
spores. (See PI. XVII, fig. 1.) There is only a very slight difference 
between the two cultures, and they are probably two strains of the 
same species. Conspicuous clamps; chlamydospores. These fungi 
turn the pulp light ochraceous buff (dry) or ochraceous tawny (wet) . 
A fine mottling with white depressed spots is noticeable in the older 
infected areas. These fungi cause considerable loss. Isolated from 
ground wood (82219-4, 6920-1). Common. 
10. One culture producing long, fine, white radiating mycelial 
strands. (See PL XVII, fig. 3.) It produces brown scierotia-like 
bodies. Conspicuous clamps; no chlamydospores. This fungus pro- 
duces no discoloration of the pulp, but its presence is made evident 
by the long, glistening loose strands of mycelium found on opening 
up a lap of pulp infected with it, and by the sclerotia-like bodies. It 
causes only slight loss of weight in the pulp. Isolated from ground 
wood (82219-13). Common on ground wood, and observed once on 
sulphite pulp. 
Fungi Imperfecta 
sphaerioidaceae 
Cytospora sp. — Culture at first white, with scanty mycelium gath- 
ered in bunches, later becoming deep slate olive, reverse black; 
hyphse hyaline to deep brown; sharply defined stroma containing 
several pyenidia; conidia hyaline, allantoid, minute. Agar normal; 
pulp deep blue-slate-black. Isolated from sulphite pulp. Rather 
common. 
7 All culture characters given are those present when the fungi are grown on plain malt-bacto agar. 
