C0NTK0L OF DECAY IN PULP AND PULP WOOD 59 
to brown, black en masse, subglobose or irregular. Isolated from 
soda pulp and ground wood (822.19-10) . 6 Almost always present 
on damp pulp. This is the common black v bread mold, which may be 
obtained at any time by exposing a culture plate or a moist piece of 
bread to the air. 
ASCOMTCETES 
PEZIZACEAE 
Peziza re/panda Wahl. — Mycelium white to cream colored, forming 
a rather thin, uneven layer over the agar, septate and colorless when 
growing in the pulp and causing no perceptible change in it; apothecia 
(fruit bodies) disk-shaped, cream-colored, 4 to 30 millimeters in 
diameter. Collected once from ground wood in a very wet place. 
Apothecia were also produced on the floor and shelves in the same 
pulp shed. 
MOLLISIACEAE 
Orbilia rubella Pers. — Apothecia small, 1 to 3 millimeters, light pink. 
Collected once on a very rotten pulp. Not isolated. 
SPHAERIACEAE 
Chaetomium spp. — Mycelium hyaline, does not discolor the pulp, 
and apparently does little damage. 
Chaetomium globosum Kunze — Culture gray; perithecia rather 
large; lateral hairs numerous, slender, slightly undulate, obscurely 
septate, minutely roughened, dark olive brown at base, lighter at tip; 
terminal hairs numerous, spreading and drooping, slender, aseptate, 
minutely roughened, dark olive brown with tapering yellow or hyaline 
tips, wavy. Spores olive brown, ovate, or subglobose. Isolated 
from sulphite pulp. Observed twice. 
Chaetomium funicolum Cooke — Culture gray blue-green; perithecia 
smaller; lateral hairs few, straight, rigid, septate, tapering to collapsed 
tip, olive brown at base to hyaline at tip; terminal hairs profusely 
branched dichotomously, with branches reflexed, roughened, dark 
olive brown at base to hyaline at tips; spores light olive brown, ovate 
to lemon shaped. Isolated from ground wood. Observed once. 
Hymenomtcetes 
agaricaceae 
Paxillus panuoides Fr. — Mycelium white, becoming light cream 
with age, forming compact sheets over the surface of the medium. 
(See PI. XVII, fig. 2.) In slant cultures, and sometimes in plate 
cultures, fairly large compact masses of hyphse are produced. The 
sporophores are more or less fan shaped, either sessile or with a very 
short lateral stipe. (See PL XVIII, figs. 1 and 2.) They are pure 
white on top when fresh, becoming yellowish with age, yellowish 
brown below. The spores are yellowish brown. This is one of the 
hymenomycetes which produces "red rust 7 ' or "red rot" in pulp. 
It is the only one found on this occasion producing sporophores on pulp. 
It colors the pulp pinkish buff or cinnamon buff to cinnamon (dry), 
6 The culture numbers are given for those fungi which were used to obtain the data shown in Tables 13, 14, 
15, 16, and 17. 
