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The diameter of the fairy rings produced by this mushroom 

 depends, naturally, upon age. One of the smallest seen is shown 

 in Fig. I." It was 3.3 meters across. Growth is slow, as shown 

 by observations at Tolland. One of the rings, Fig. 2, is cut about 

 1.5 meters from the periphery by a roadway across which the 

 mycelium does not extend. Evidently this small part thus 

 separated from the main portion of the ring must have been in 

 existence when the road was first used. This is known to be 



Fig. I. Small Fairy Ring (3.3 m. in diameter) of Tricholoma praemagnum. 

 The light-colored vegetation within the ring is the Mountain Sage, Artemisia 

 frigida. 



about 15 years ago. Hence the radial growth of this ring can 

 not have averaged more than i dm. yearly. Since the part of the 

 ring now separated off, matches very well the part on the other 

 side of the road there is every reason to believe that it must have 

 been more than a mere fragment at the time the road was first 

 established. It would therefore appear that the growth of the ring 

 is probably much less than i dm. per annum. Examination of 



