CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. Ill 



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. 



