SUPPLEMENT 



form and coloring. There are other sorts of Polyporus that are 

 extremely mischievous, forming the so-called dry rot of timber in 

 dark cellars, mines, etc. The "stink-horn" fungus is rather com- 

 mon in the vicinity of L,os Angeles. When it first appears above 

 ground, it is enclosed in a brown or purplish membrane, and looks 

 rather like a potato ; but soon this membrane bursts, and the spore- 

 fruit, in the form of horns with a honeycombed surface, appears. The 

 foetid odor is overpowering; it serves to attract flies, which feed on the 

 sticky fluid surrounding the spores and thus carry many of them away. 



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