-76 THE PLANT WORLD 



by seeing many mummied fruits on the nearest bush, of 

 Amelanchier, not over ten yeards away, that bore the remains 

 of some Roestelia possessing a firm peridium not easily 

 affected by the weather, and which we subsequently learned 

 had in consequence been referred to Roestelia Harknessiana.* 



Earlier in the day we had seen similarly affected fruit 

 hanging to clumps of Amelanchier, with many small trees 

 of cedar near, and even with branches intermixed, on which 

 we had been able to detect no Gymnosporanghtm. . Darkness 

 held in check our desire to revisit these spots, and even in 

 the morning it was necessary to await a lull in the snow 

 storm that had overtaken us. On arriving at the place where 

 the day before no Gymnosporangiiim was visible to our 

 rather careful scrutiny, we found every cedar that was not 

 too far from an affected Amelanchier to be sticky with the 

 brownish yellow masses of the rust. The melting snow had 

 after all served us a good turn by swelling up the usually 

 Inconspicuous telia into quivering jelly masses of the size of 

 peas. As it was apparent that the greatest amount of the 

 brown jelly occurred on trees nearest to Amelanchier with 

 mummied fruit, the conclusion was simply that the two fungi 

 bore a reciprocal relation. Telial material was carried away 

 with much confidence that sowings on Amelanchier fruit 

 would produce fresh Roestelia corresponding to those seen 

 in weathered condition. ** 



Both the weather and the limits of time now made it 

 advisable to bring our collecting trip to a close. In twelve 

 days from the time of starting we were again in Lafayette 

 with much valuable material for both cultural and system- 

 atic study, and a knowledge of field conditions that no other 

 means could adequately supply. 



There are few localities in any part of the country that 

 do not possess some species of rusts worthy of careful atten- 

 tion. Each locality will require a number of seasons to reveal 



* The name since given to this is Roestelia Harltnessianoides Kern, 

 see Bull. Torrey Club, 34:463. 1907. 



** The cultures were successful, see Jour. Myc, 14:24. 190S. 



