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CHROMOGENIC FUNGI WHICH DISCOLOR woop. 111 
of the filaments is insoluble in alcohol, ether, chloroform, 
benzol, alkalis and acids. The brown color of the fungus 
apparently contains traces of a blue pigment whose color is 
transmitted by the wood cells of pine more readily than the 
brown color. 
2. GRAPHIUM. 
The mycelium of Graphium imparts a dingy gray or 
brown, or even a black color to the wood it enters. This is 
caused by the color of the mycelium, and is due to no solu- 
ble pigment. The cells of the wood remain unstained. 
3. HoRMODENDRON AND HorMIScIUM. 
The cells of wood penetrated by these wood-blackeners 
are not stained, the color being due to the presence of the 
mycelium of the fungi. It is not yet known whether the 
color is one that may be extracted. 
4, PENICILLIUM. 
The species of Penicillium discoloring wood form a 
soluble red or yellow pigment which is taken up by the cell 
walls of the wood, giving them a red or yellow stain which 
fades when the wood dries out, but is increased in intensity 
when it is moistened again. 
5. FusARIUM. 
The wood stained by Fusarium is discolored both by a 
soluble pigment which is secreted by the fungus and taken 
up by the wood cells and by the presence of colored hyphae 
and chlamydospores. 
The investigation of color production by these fungi will 
be carried on in the future, and it is hoped that the nature 
and composition of some of these pigments may be discov- 
ered, and that other facts may be found worthy of publica- 
tion. 
