60 
or mikado brown to russet (wet) . Pulp infected with this fungus 
becomes very brittle. Isolated from " red-rusted " pulp, later from a 
sporophore which developed on the same lot of pulp when placed in 
a sterile Wardian case. This is the only hymenomycete which was 
found producing a fruit body. A very common species. 
UNIDENTIFIED HYMENOMYCETES 
In the absence of fruit bodies, which (with the exception above 
noted) the investigators were unable to find on pulp or to develop 
in culture, there is no way by which cultures of hymenomycetes may 
be identified except by comparison with cultures of known fungi. 
Although these species were compared with large numbers of known 
hymenomycetes in pure cultures, none was definitely identified. For 
convenience they will be grouped as follows: 
1. Four cultures varying but slightly; mycelium soggy, appressed, 
forming compact sheets over the agar; large, conspicuous clamps; 
barrel-shaped or globose interstitial and terminal chlamydospores 
(PI. XVI, fig. 1), in more or less regular zones in Petri dish cultures, 
white or cream colored, narrow or wide (PI. XVII, figs. 4 and 6). 
These fungi bleach pulp somewhat, but are not vigorous wood de- 
stroyers. Isolated from ground-wood (10918-10, 102019-la, 6320-1) 
and sulphite pulp. Very common. 
2. One culture; mycelium soggy, appressed; differs from 1 in that 
the mycelium does not form such compact sheets over the agar; 
chlamydospores in more or less distinct radiating lines. (See PL 
XVII, fig. 5.) In older cultures small white tufts of mycelium 
appear, scattered sometimes over the surface, but more frequently 
around the edge of the plate. In jar cultures, and sometimes in 
slants, dense masses of chlamydospores are formed on the surface of 
the glass. (See PI. XIX, fig. 1.) Chlamydospores barrel shaped, 
ellipsoid, or somewhat lemon shaped, terminal or intercalary. Clamps 
conspicuous. (See PL XVI, fig. 2.) Areas are cream-colored when 
freshly infected, but become pinkish buff (dry) to clay color (wet), 
buff y brown (dry) to olive brown (wet), and finally mummy brown 
(dry) to dark clove brown (wet) . This fungus causes great damage 
which, in severe infections, may become an entire loss, the pulp 
becoming so brittle that it can not be used. (See PL XIX.) Isolated 
from ground wood (82219-15). Common on ground wood and 
observed once on sulphite pulp. 
3. Two cultures very nearly alike; mycelium soggy, appressed; 
chlamydospores in creamy masses or in small white mealy specks. 
Newly infected areas cream-colored, later pinkish buff (dry) to cin- 
namon buff (wet), tawny olive (dry) to Chaetura black (wet). 
Infected pulp very friable, useless. Isolated from ground wood 
(4620-1 , 4620-2) . Common. 
4. One culture; nrycelium appressed, soggy, forming compact sheet; 
clamps conspicuous; no chlamydospores. Does not discolor the pulp 
and causes very little damage. Isolated from sulphite pulp (6920-2). 
Observed once. 
5. One culture; mycelium appressed, soggy, forming compact 
sheets over surface of plates, with here and there fluffy white bunches 
of mycelium; clamps conspicuous; maize yellow, ellipsoid or globose 
chlamydospores produced on surface, forming a yellow mealy mass. 
