64 DISEASES OF FIELD & GARDEN CROPS. [OH. 



It is an above-ground truffle-hunting mycelium. If there 

 are no truffles in the wood, the mycelium, of course, 

 perishes ; but in some other wood where the moss grows, 

 the truffles will certainly occur. When the moss does 

 grow in the same wood with the truffle, the parasite is 

 certain to descend by the roots, and so find the subterra- 



Fio. 23. 



Mnium Jiornum, Hedw., invaded by the mycelium of Torrubia 

 ophioglossoides, Tul. 



nean Elaphomyces. The truffle usually grows some four 

 or five inches beneath the surface of the ground, and 

 seldom so near as two inches, as shown in illustration at 

 Fig. 22, where KK shows the ground line, and LL the 

 spawn belonging to the TorruUa connected with the truffle 

 below at B. 



It is a curious fact that field mice, and probably several 

 other small mammals, are extremely fond of the truffles 

 named Elaphomyces (from elaphas, an elephant, and 

 mukes, a fungus), and these little animals are continually 



