248 



Minnesota Plant Diseases. 



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FIG. 121. The dry-rot fungus (Merulius lacrymans). Shows the surface of a pine 

 board which has been attacked by the dry-rot mycelium; it is not yet, however, com- 

 pletely converted to punk. The felted mycelium has been partially removed show- 

 ing the accentuated grain of the attacked portions. The mycelium has penetrated 

 some distance beyond the white mycelial felt. Original. 



