58 BULLETIN 1298, IT. S. DEPARTMENT OF AGRICULTURE 
Fungi imperfecta — Continued 
Mucedinaceae — Continued 
Gliocladium sp. 
Verticillium sp. 
Spicaria sp. 
Unidentified Mucedinaceae (1 culture) 
Dematiaceae 
Torula sp. 
Thielaviopsis sp. 
Stemphylium sp. 
Alternaria spp. (2 cultures) 
Unidentified Dematiaceae (22 cultures) 
Tub erculariaceae 
Fusarium spp. (9 cultures) 
None of the hymenomycetes which are commonly found on 
pulp wood have been isolated from pulp, although the following 
species obtained from pulp wood or from boards taken from pulp 
sheds grew when planted on pulp : Fomes roseus Fr., Lentinus lepideus 
Fr., Peniophora tabacina Burt., Stereum sanguinolentum A. and S., 
Corticmm galactinum Fr., and six undetermined species (cultures 
4620-3, 4620-4, 61420-3, 61420-4, 61420-5, 61420-7). (See 
Table 16.) 
description of cultures obtained from pulp and water 
Physomycetes 
mucoraceae 
It is probable that several species of the Mucoraceae grow on pulp, 
but for the reasons that they seem to be superficial, do not produce a 
definite discoloration, and generally do not produce spores in numbers 
large enough to damage the pulp, little attention was given this group. 
Only three species, which occur frequently, have been isolated. 
Mucor plumbeus Bon. — Mycelium submerged, hyaline; chlamy- 
dospores common, hyaline to fight brown; 5 sporangiophores upright, 
about 1 centimeter high, branches cymose or irregular, forming a 
hoary turf in young cultures; sporangia at first gray then olive black, 
walls very finely aculeated (PL XVI, fig. 4) ; columella cylindrical or 
pyriform, with one or more tapering or blunt spines on top; spores 
globose, light brown. Isolated from soda pulp. Very common on all 
kinds of pulp. 
Mucor racemous Fres. — Mycelium submerged, septate; chlamydo- 
spores frequent; sporangiophores upright, very short, 1 to 5 milli- 
meters, septate, branched, cymose or irregular; sporangia small, 
white then blue-gray, walls very finely aculeated; columella hemi- 
spherical or short cylindrical; spores light brown. Isolated from 
ground wood. Common. 
RMzopus nigricans Ehrenb. — Aerial mycelium white, aseptate, be- 
coming dark and septate in very old cultures; rhizoids numerous; 
sporangiphores fasciculate, erect, aseptate, arising from the nodes; 
sporangia globose, olive black; columella hemisperical; spores gray 
* Colors used in the following descriptions have, in most cases, been matched as closely as possible with 
Robert Ridgway's Color Standards and Color Nomenclature, 1912. 
