5 

 %^ 



^^ 5/:^ ACKNOWLEDGEMENTS 



We wish to thank Drs. Ernest O. Beal, Vernon L. Harms, Arthur C. 

 Mathieson, and Eugene C. Ogden for their helpful comments on the 

 manuscript. We are also grateful to the curators of the following her- 

 baria for use of their collections: BOSC, BRU, CONN, CUW, GH, 

 HNH, KIRI, MASS, MAINE, NCBS, NHA, NEBC, VT, YU. A special 

 thanks is extended to Pamela Bruns who prepared the illustrations. 



This Bulletin is dedicated to the late Dr. E. O. Beal who died on 

 August 31, 1980. 



Programs of the New Hampshire Agricultural Experiment Station are open to all 

 persons without regard to race, color, national origin or sex. The University of New 

 Hampshire is an Affirmative Action/Equal Opportunity Employer. 



