66 BULLETIN 1298, U. S. DEPARTMENT OF AGRICULTURE 
Fusarium sp. — Mycelium scanty, pinkish; no chlamydospores; 
sporodochia small, discoid, Mars brown; conidia one to five celled. 
Agar slightly purple; pulp deep purplish vinaceous. Isolated from 
sulphite pulp and ground- wood. Observed twice. 
Fusarium sp. — Mycelium very scanty, white, no chlamydospores; 
sporodochia cream, light Terre Verte to neutral red; conidia mostly 
fixe celled, very few one celled. (See PL XVI, fig. 16.) Agar slightly 
red; pulp deep purplish vinaceous. Isolated from ground- wood. 
Observed once. 
Fumrium sp. — Cultures mealy to subgelatinous, from white to pale 
cinnamon pink; hyphse hyaline; numerous pink intercalary chlamy- 
dospores; spores abundant, small, ovoid, hyaline, apparently pro- 
duced in clumps at ends of branches (PL XVI, fig. 18) ; very few 
typical Fusarium spores found; no well-defined sporodochia. Agar 
normal, pulp light pinkish cinnamon. Isolated from ground-wood 
(82219-1) and sulphite pulp. Very common. 
CLASSIFICATION OF ORGANISMS BASED ON COLOR CHANGES IN PULP 
The fungi just described have been grouped according to their 
morphology, which is the true mycological classification. In the 
following key the fungi are grouped according to their color reaction 
on pulp. This key is an attempt to present the fungi in such a way 
that those least familiar with them may be able to determine which 
organisms may be present and thus to decide whether an organism is 
a hymenomycete, causing a loss in the wood fiber, or a mold, producing 
simply a discoloration of the pulp. Each of the fungi investigated 
either (a) bleaches pulp, (b) causes no color change in the pulp, 
(c) produces a color change which may be due either to chemical 
disintegration of the pulp itself or to pigments produced by the 
fungi, or (d) produces a color change which is due to the colored 
mycelia which are scattered through the pulp. The key classifies 
the fungi described above according to these color effects, as follows: 
Organisms that bleach pulp. 
Producing no superficial spores. 
Hyinenomycetes, Oidium sp. 
Organisms that cause no color change in pulp. 
Producing no superficial spores. 
Hymenomycetes. 
Producing superficial spores. 
Spores maize yellow. 
Hymenomycetes. 
Spores green or blue. 
Triclioderma spp., Aspergillus spp., PeniciTlium spp., Citro- 
myces spp., Glioclaaium sp. 
Spores black. 
Papulospora nigra, Aspergillus niger. 
Spores brown. 
Triclioderma sp., PeniciTlium sp., Verticillium sp. 
Producing superficial ascocarps (fruit bodies). 
Asci in apothecia (open, saucer shaped). 
Peziza repanda, Orbilia rubella. 
Asci in penthecia (nearly closed, globose). 
Chaetomium globosum, Chactomium funicolum. 
